A pyramid (from Greek: πυραμίς pyramís) is a structure whose outer surfaces are triangular and converge to a single point at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilateral, or of any polygon shape. As such, a pyramid has at least three outer triangular surfaces (at least four faces including the base). The square pyramid, with a square base and four triangular outer surfaces, is a common version.
A pyramid's design, with the majority of the weight closer to the ground, and with the pyramidion on top, means that less material higher up on the pyramid will be pushing down from above. This distribution of weight allowed early civilizations to create stable monumental structures.
Civilizations in many parts of the world have built pyramids. The largest pyramid by volume is the Great Pyramid of Cholula, in the Mexican state of Puebla. For thousands of years, the largest structures on Earth were pyramids—first the Red Pyramid in the Dashur Necropolis and then the Great Pyramid of Khufu, both in Egypt—the latter is the only one of the Seven Wonders of the Ancient World still remaining.
The Mesopotamians built the earliest pyramidal structures, called ziggurats. In ancient times, these were brightly painted in gold/bronze. Since they were constructed of sun-dried mud-brick, little remains of them. Ziggurats were built by the Sumerians, Babylonians, Elamites, Akkadians, and Assyrians for local religions. Each ziggurat was part of a temple complex which included other buildings. The precursors of the ziggurat were raised platforms that date from the Ubaid period during the fourth millennium BC. The earliest ziggurats began near the end of the Early Dynastic Period. The latest Mesopotamian ziggurats date from the 6th century BC.
Built in receding tiers upon a rectangular, oval, or square platform, the ziggurat was a pyramidal structure with a flat top. Sun-baked bricks made up the core of the ziggurat with facings of fired bricks on the outside. The facings were often glazed in different colors and may have had astrological significance. Kings sometimes had their names engraved on these glazed bricks. The number of tiers ranged from two to seven. It is assumed that they had shrines at the top, but there is no archaeological evidence for this and the only textual evidence is from Herodotus. Access to the shrine would have been by a series of ramps on one side of the ziggurat or by a spiral ramp from base to summit.
The most famous pyramids are the Egyptian — huge structures built of brick or stone, some of which are among the world's largest constructions. They are shaped as a reference to the rays of the sun. Most pyramids had a polished, highly reflective white limestone surface, to give them a shining appearance when viewed from a distance. The capstone was usually made of hard stone – granite or basalt – and could be plated with gold, silver, or electrum and would also be highly reflective. After 2700 BC, the ancient Egyptians began building pyramids, until around 1700 BC. The first pyramid was erected during the Third Dynasty by the Pharaoh Djoser and his architect Imhotep. This step pyramid consisted of six stacked mastabas. The largest Egyptian pyramids are those at the Giza pyramid complex. The Egyptian sun god Ra, considered the father of all pharaohs, was said to have created himself from a pyramid-shaped mound of earth before creating all other gods.
The age of the pyramids reached its zenith at Giza in 2575–2150 BC. Ancient Egyptian pyramids were in most cases placed west of the river Nile because the divine pharaoh's soul was meant to join with the sun during its descent before continuing with the sun in its eternal round. As of 2008, some 135 pyramids have been discovered in Egypt. The Great Pyramid of Giza is the largest in Egypt and one of the largest in the world. At 481ft, it was the tallest building in the world until Lincoln Cathedral was finished in 1311 AD. The base is over 52,600 square metres (566,000 sq ft) in area. The Great Pyramid of Giza is one of the Seven Wonders of the Ancient World. It is the only one to survive into modern times. The Ancient Egyptians covered the faces of pyramids with polished white limestone, containing great quantities of fossilized seashells. Many of the facing stones have fallen or have been removed and used for construction in Cairo.
Most pyramids are located near Cairo, with only one royal pyramid being located south of Cairo, at the Abydos temple complex. The pyramid at Abydos, Egypt were commissioned by Ahmose I who founded the 18th Dynasty and the New Kingdom. The building of pyramids began in the Third Dynasty with the reign of King Djoser. Early kings such as Snefru built several pyramids, with subsequent kings adding to the number of pyramids until the end of the Middle Kingdom.
The last king to build royal pyramids was Ahmose, with later kings hiding their tombs in the hills, such as those in the Valley of the Kings in Luxor's West Bank. In Medinat Habu, or Deir el-Medina, smaller pyramids were built by individuals. Smaller pyramids with steeper sides were also built by the Nubians who ruled Egypt in the Late Period.
While pyramids are associated with Egypt, the nation of Sudan has 220 extant pyramids, the most numerous in the world. Nubian pyramids were constructed (roughly 240 of them) at three sites in Sudan to serve as tombs for the kings and queens of Napata and Meroë. The pyramids of Kush, also known as Nubian Pyramids, have different characteristics than the pyramids of Egypt. The Nubian pyramids were constructed at a steeper angle than Egyptian ones. Pyramids were still being built in Sudan as late as 200 AD.
One of the unique structures of Igbo culture was the Nsude Pyramids, at the Nigerian town of Nsude, northern Igboland. Ten pyramidal structures were built of clay/mud. The first base section was 60 ft. in circumference and 3 ft. in height. The next stack was 45 ft. in circumference. Circular stacks continued, till it reached the top. The structures were temples for the god Ala/Uto, who was believed to reside at the top. A stick was placed at the top to represent the god's residence. The structures were laid in groups of five parallel to each other. Because it was built of clay/mud like the Deffufa of Nubia, time has taken its toll requiring periodic reconstruction.
Pausanias (2nd century AD) mentions two buildings resembling pyramids, one, 19 kilometres (12 mi) southwest of the still standing structure at Hellenikon, a common tomb for soldiers who died in a legendary struggle for the throne of Argos and another which he was told was the tomb of Argives killed in a battle around 669/8 BC. Neither of these still survive and there is no evidence that they resembled Egyptian pyramids.
There are also at least two surviving pyramid-like structures still available to study, one at Hellenikon and the other at Ligourio/Ligurio, a village near the ancient theatre Epidaurus. These buildings were not constructed in the same manner as the pyramids in Egypt. They do have inwardly sloping walls but other than those there is no obvious resemblance to Egyptian pyramids. They had large central rooms (unlike Egyptian pyramids) and the Hellenikon structure is rectangular rather than square, 12.5 by 14 metres (41 by 46 ft) which means that the sides could not have met at a point. The stone used to build these structures was limestone quarried locally and was cut to fit, not into freestanding blocks like the Great Pyramid of Giza.
The dating of these structures has been made from the pot shards excavated from the floor and on the grounds. The latest dates available from scientific dating have been estimated around the 5th and 4th centuries. Normally this technique is used for dating pottery, but here researchers have used it to try to date stone flakes from the walls of the structures. This has created some debate about whether or not these structures are actually older than Egypt, which is part of the Black Athena controversy.
Mary Lefkowitz has criticised this research. She suggests that some of the research was done not to determine the reliability of the dating method, as was suggested, but to back up an assumption of age and to make certain points about pyramids and Greek civilization. She notes that not only are the results not very precise, but that other structures mentioned in the research are not in fact pyramids, e.g. a tomb alleged to be the tomb of Amphion and Zethus near Thebes, a structure at Stylidha (Thessaly) which is just a long wall, etc. She also notes the possibility that the stones that were dated might have been recycled from earlier constructions. She also notes that earlier research from the 1930s, confirmed in the 1980s by Fracchia was ignored. She argues that they undertook their research using a novel and previously untested methodology in order to confirm a predetermined theory about the age of these structures.
Liritzis responded in a journal article published in 2011, stating that Lefkowitz failed to understand and misinterpreted the methodology.
The Pyramids of Güímar refer to six rectangular pyramid-shaped, terraced structures, built from lava stone without the use of mortar. They are located in the district of Chacona, part of the town of Güímar on the island of Tenerife in the Canary Islands. The structures have been dated to the 19th century and their original function explained as a byproduct of contemporary agricultural techniques.
Autochthonous Guanche traditions as well as surviving images indicate that similar structures (also known as, "Morras", "Majanos", "Molleros", or "Paredones") could once have been found in many locations on the island. However, over time they have been dismantled and used as a cheap building material. In Güímar itself there were nine pyramids, only six of which survive.
There are many square flat-topped mound tombs in China. The First Emperor Qin Shi Huang (circa 221 BC, who unified the 7 pre-Imperial Kingdoms) was buried under a large mound outside modern day Xi'an. In the following centuries about a dozen more Han Dynasty royals were also buried under flat-topped pyramidal earthworks.
A number of Mesoamerican cultures also built pyramid-shaped structures. Mesoamerican pyramids were usually stepped, with temples on top, more similar to the Mesopotamian ziggurat than the Egyptian pyramid.
The largest pyramid by volume is the Great Pyramid of Cholula, in the Mexican state of Puebla. Constructed from the 3rd century BC to the 9th century AD, this pyramid is considered the largest monument ever constructed anywhere in the world, and is still being excavated. The third largest pyramid in the world, the Pyramid of the Sun, at Teotihuacan is also located in Mexico. There is an unusual pyramid with a circular plan at the site of Cuicuilco, now inside Mexico City and mostly covered with lava from an eruption of the Xitle Volcano in the 1st century BC. There are several circular stepped pyramids called Guachimontones in Teuchitlán, Jalisco as well.
Pyramids in Mexico were often used as places of human sacrifice. For the re-consecration of Great Pyramid of Tenochtitlan in 1487, Where, according to Michael Harner, "one source states 20,000, another 72,344, and several give 80,400".
Many pre-Columbian Native American societies of ancient North America built large pyramidal earth structures known as platform mounds. Among the largest and best-known of these structures is Monks Mound at the site of Cahokia in what became Illinois, completed around 1100 AD, which has a base larger than that of the Great Pyramid at Giza. Many of the mounds underwent multiple episodes of mound construction at periodic intervals, some becoming quite large. They are believed to have played a central role in the mound-building peoples' religious life and documented uses include semi-public chief's house platforms, public temple platforms, mortuary platforms, charnel house platforms, earth lodge/town house platforms, residence platforms, square ground and rotunda platforms, and dance platforms. Cultures who built substructure mounds include the Troyville culture, Coles Creek culture, Plaquemine culture and Mississippian cultures.
The 27-metre-high Pyramid of Cestius was built by the end of the 1st century BC and still exists today, close to the Porta San Paolo. Another one, named Meta Romuli, standing in the Ager Vaticanus (today's Borgo), was destroyed at the end of the 15th century.
Many giant granite temple pyramids were made in South India during the Chola Empire, many of which are still in religious use today. Examples of such pyramid temples include Brihadisvara Temple at Thanjavur, the Brihadisvara Temple at Gangaikonda Cholapuram and the Airavatesvara Temple at Darasuram. However, the largest temple pyramid in the area is Sri Rangam in Srirangam, Tamil Nadu. The Thanjavur temple was built by Raja Raja Chola in the 11th century. The Brihadisvara Temple was declared by UNESCO as a World Heritage Site in 1987; the Temple of Gangaikondacholapuram and the Airavatesvara Temple at Darasuram were added as extensions to the site in 2004.
Next to menhir, stone table, and stone statue; Austronesian megalithic culture in Indonesia also featured earth and stone step pyramid structures called punden berundak as discovered in Pangguyangan site near Cisolok and in Cipari near Kuningan. The construction of stone pyramids is based on the native beliefs that mountains and high places are the abode for the spirit of the ancestors.
The step pyramid is the basic design of 8th century Borobudur Buddhist monument in Central Java. However the later temples built in Java were influenced by Indian Hindu architecture, as displayed by the towering spires of Prambanan temple. In the 15th century Java during late Majapahit period saw the revival of Austronesian indigenous elements as displayed by Sukuh temple that somewhat resemble Mesoamerican pyramid, and also stepped pyramids of Mount Penanggungan.
With the Egyptian Revival movement in the nineteenth and early twentieth century, pyramids were becoming more common in funerary architecture. This style was especially popular with tycoons in the US. Hunt's Tomb in Phoenix, Arizona and Schoenhofen Pyramid Mausoleum in Chicago are some of the notable examples but Henry Bergh, Charles Debrille Poston and many others were buried in pyramid shape mausoleums. People in Europe also adopted this style. One of them was Branislav Nušić who was buried in one such tomb. Even today some people build pyramid tombs for themselves. Nicolas Cage bought a pyramid tomb for himself in a famed New Orleans graveyard.
Dramatic structure is the structure of a dramatic work such as a play or film. Many scholars have analyzed dramatic structure, beginning with Aristotle in his Poetics (c. 335 BCE). This article looks at Aristotle's analysis of the Greek tragedy and on Gustav Freytag's analysis of ancient Greek and Shakespearean drama.Egyptian pyramids
The Egyptian pyramids are ancient pyramid-shaped masonry structures located in Egypt. As of November 2008, sources cite either 118 or 138 as the number of identified Egyptian pyramids. Most were built as tombs for the country's pharaohs and their consorts during the Old and Middle Kingdom periods.The earliest known Egyptian pyramids are found at Saqqara, northwest of Memphis. The earliest among these is the Pyramid of Djoser, which was built c. 2630–2610 BC during the Third Dynasty. This pyramid and its surrounding complex were designed by the architect Imhotep, and are generally considered to be the world's oldest monumental structures constructed of dressed masonry.The most famous Egyptian pyramids are those found at Giza, on the outskirts of Cairo. Several of the Giza pyramids are counted among the largest structures ever built. The Pyramid of Khufu at Giza is the largest Egyptian pyramid. It is the only one of the Seven Wonders of the Ancient World still in existence.English football league system
The English football league system, also known as the football pyramid, is a series of interconnected leagues for men's association football clubs in England, with five teams from Wales (from 2019-20), one from Guernsey and one from Jersey also competing. The system has a hierarchical format with promotion and relegation between leagues at different levels, allowing even the smallest club the theoretical possibility of ultimately rising to the very top of the system, although in practice it would take a team at the bottom levels at least two decades of consistently finishing at or near the top of each successive league to reach the top level, and even then additional restrictions, particularly in regard to stadium facilities, would then come into effect at the highest levels that could prevent a club from being allowed access to the top levels. There are more than 140 individual leagues, containing more than 480 divisions.The exact number of clubs varies from year to year as clubs join and leave leagues, fold or merge altogether, but an estimated average of 15 clubs per division implies that more than 7,000 teams of nearly 5,300 clubs are members of a league in the English men's football league system.
As there are no official definitions of any level below 11, any references to the structure at level 12 and below should not be regarded as definitive.
The pyramid for women's football in England runs separately to nine tiers and some England-based men's clubs play outside the English football league system.Eye of Providence
The Eye of Providence (or the all-seeing eye of God) is a symbol, having its origin in Christian iconography, showing an eye often surrounded by rays of light or a glory and usually enclosed by a triangle. It represents the eye of God watching over humanity (the concept of divine providence). In the modern era, a notable depiction of the eye is the reverse of the Great Seal of the United States, which appears on the United States one-dollar bill.Food pyramid (nutrition)
A food pyramid or diet pyramid is a triangular diagram representing the optimal number of servings to be eaten each day from each of the basic food groups. The first pyramid was published in Sweden in 1974. The 1992 pyramid introduced by the United States Department of Agriculture (USDA) was called the "Food Guide Pyramid" or "Eating Right Pyramid". It was updated in 2005 to "MyPyramid", and then it was replaced by "MyPlate" in 2011.Giza pyramid complex
The Giza pyramid complex, also called the Giza Necropolis, is the site on the Giza Plateau in Egypt that includes the Great Pyramid of Giza, the Pyramid of Khafre, and the Pyramid of Menkaure, along with their associated pyramid complexes and the Great Sphinx of Giza. All were built during the Fourth Dynasty of the Old Kingdom of Ancient Egypt. The site also includes several cemeteries and the remains of a workers' village.
The site is at the edges of the Western Desert, approximately 9 km (5 mi) west of the Nile River in the city of Giza, and about 13 km (8 mi) southwest of the city centre of Cairo.
The Great Pyramid and the Pyramid of Khafre are the largest pyramids built in ancient Egypt, and they have historically been common as emblems of ancient Egypt in the Western imagination. They were popularised in Hellenistic times, when the Great Pyramid was listed by Antipater of Sidon as one of the Seven Wonders of the World. It is by far the oldest of the ancient Wonders and the only one still in existence.Great Pyramid of Giza
The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza pyramid complex bordering present-day El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact.
Based on a mark in an interior chamber naming the work gang and a reference to the fourth dynasty Egyptian Pharaoh Khufu, some Egyptologists believe that the pyramid was thus built as a tomb over a 10- to 20-year period concluding around 2560 BC. Initially at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years until Lincoln Cathedral was finished in 1311 AD. Originally, the Great Pyramid was covered by limestone casing stones that formed a smooth outer surface; what is seen today is the underlying core structure. Some of the casing stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories about the Great Pyramid's construction techniques. Most accepted construction hypotheses are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place.
There are three known chambers inside the Great Pyramid. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished. The so-called Queen's Chamber and King's Chamber are higher up within the pyramid structure. The main part of the Giza complex is a set of buildings that included two mortuary temples in honour of Khufu (one close to the pyramid and one near the Nile), three smaller pyramids for Khufu's wives, an even smaller "satellite" pyramid, a raised causeway connecting the two temples, and small mastaba tombs surrounding the pyramid for nobles.Maslow's hierarchy of needs
Maslow's hierarchy of needs is a theory in psychology proposed by Abraham Maslow in his 1943 paper "A Theory of Human Motivation" in Psychological Review. Maslow subsequently extended the idea to include his observations of humans' innate curiosity. His theories parallel many other theories of human developmental psychology, some of which focus on describing the stages of growth in humans. He then decided to create a classification system which reflected the universal needs of society as its base and then proceeding to more acquired emotions. Maslow's hierarchy of needs is used to study how humans intrinsically partake in behavioral motivation. Maslow used the terms "physiological", "safety", "belonging and love", "social needs" or "esteem", and "self-actualization" to describe the pattern through which human motivations generally move. This means that in order for motivation to occur at the next level, each level must be satisfied within the individual themselves. Furthermore, this theory is a key foundation in understanding how drive and motivation are correlated when discussing human behavior. Each of these individual levels contains a certain amount of internal sensation that must be met in order for an individual to complete their hierarchy. The goal in Maslow's theory is to attain the fifth level or stage: self-actualization.Maslow's theory was fully expressed in his 1954 book Motivation and Personality. The hierarchy remains a very popular framework in sociology research, management training and secondary and higher psychology instruction. Maslow's classification hierarchy has been revised over time. The original hierarchy states that a lower level must be completely satisfied and fulfilled before moving onto a higher pursuit. However, today scholars prefer to think of these levels as continuously overlapping each other. This means that the lower levels may take precedence back over the other levels at any point in time.Memphis Pyramid
The Memphis Pyramid, initially known as the Great American Pyramid, formerly referred to as the Pyramid Arena and locally referred to as The Pyramid, was originally built as a 20,142-seat arena located in downtown Memphis, in the U.S. state of Tennessee, at the banks of the Mississippi River. The facility was built in 1991 and was originally owned and operated jointly by the city of Memphis and Shelby County; Shelby County sold its share to Memphis in April 2009. Its structure plays on the city's namesake in Egypt, known for its ancient pyramids. It is 321 feet (98 m) (about 32 stories) tall and has base sides of 591 feet (180 m); it is by some measures the tenth-tallest pyramid in the world.The Memphis Pyramid has not been regularly used as a sports or entertainment venue since 2004. In 2015, the Pyramid re-opened as a Bass Pro Shops "megastore", which includes shopping, a hotel, restaurants, a bowling alley, and an archery range, with an outdoor observation deck adjacent to its apex.Multi-level marketing
Multi-level marketing (MLM), also called pyramid selling, network marketing, and referral marketing, is a marketing strategy for the sale of products or services where the revenue of the MLM company is derived from a non-salaried workforce selling the company's products/services, while the earnings of the participants are derived from a pyramid-shaped or binary compensation commission system.
Although each MLM company dictates its own specific financial compensation plan for the payout of any earnings to their respective participants, the common feature that is found across all MLMs is that the compensation plans theoretically pay out to participants only from two potential revenue streams. The first is paid out from commissions of sales made by the participants directly to their own retail customers. The second is paid out from commissions based upon the wholesale purchases made by other distributors below the participant who have recruited those other participants into the MLM; in the organizational hierarchy of MLMs, these participants are referred to as one's down line distributors.MLM salespeople are, therefore, expected to sell products directly to end-user retail consumers by means of relationship referrals and word of mouth marketing, but most importantly they are incentivized to recruit others to join the company's distribution chain as fellow salespeople so that these can become down line distributors. According to a report that studied the business models of 350 MLMs, published on the Federal Trade Commission's website, at least 99% of people who join MLM companies lose money. Nonetheless, MLMs function because downline participants are encouraged to hold onto the belief that they can achieve large returns, while the statistical improbability of this is de-emphasised. MLMs have been made illegal or otherwise strictly regulated in some jurisdictions as a mere variation of the traditional pyramid scheme, including in mainland China.Old Kingdom of Egypt
In ancient Egyptian history, the Old Kingdom is the period spanning c. 2686–2181 BC. It is also known as the "Age of the Pyramids" or the "Age of the Pyramid Builders", as it encompasses the reigns of the great pyramid builders of the Fourth Dynasty—King Sneferu perfected the art of pyramid-building and the pyramids of Giza were constructed under the kings Khufu, Khafre and Menkaure. Egypt attained its first sustained peak of civilization—the first of three so-called "Kingdom" periods (followed by the Middle Kingdom and New Kingdom) which mark the high points of civilization in the lower Nile Valley.
The term itself was coined by 18th-century historians, and the distinction between the Early Dynastic Period and Old Kingdom is not one which would have been recognized by Ancient Egyptians. Not only was the last king of the Early Dynastic Period related to the first two kings of the Old Kingdom, but the "capital"—the royal residence—remained at Ineb-Hedg, the Ancient Egyptian name for Memphis. The basic justification for a separation between the two periods is the revolutionary change in architecture accompanied by the effects on Egyptian society and economy of large-scale building projects.The Old Kingdom is most commonly regarded as the period from the Third Dynasty through the Sixth Dynasty (2686–2181 BC). Information from the Fourth through Sixth Dynasties of Egypt is scarce, and historians regard the history of the era as literally "written in stone" and largely architectural in that it is through the monuments and their inscriptions that scholars have been able to construct a history. Egyptologists also include the Memphite Seventh and Eighth Dynasties in the Old Kingdom as a continuation of the administration centralized at Memphis. While the Old Kingdom was a period of internal security and prosperity, it was followed by a period of disunity and relative cultural decline referred to by Egyptologists as the First Intermediate Period. During the Old Kingdom, the king of Egypt (not called the Pharaoh until the New Kingdom) became a living god who ruled absolutely and could demand the services and wealth of his subjects.Under King Djoser, the first king of the Third Dynasty of the Old Kingdom, the royal capital of Egypt was moved to Memphis, where Djoser established his court. A new era of building was initiated at Saqqara under his reign. King Djoser's architect, Imhotep, is credited with the development of building with stone and with the conception of the new architectural form—the step pyramid. The Old Kingdom is perhaps best known for the large number of pyramids constructed at this time as burial places for Egypt's kings.Ponzi scheme
A Ponzi scheme (, Italian: [ˈpontsi]; also a Ponzi game) is a form of fraud that lures investors and pays profits to earlier investors with funds from more recent investors. The scheme leads victims to believe that profits are coming from product sales or other means, and they remain unaware that other investors are the source of funds. A Ponzi scheme can maintain the illusion of a sustainable business as long as new investors contribute new funds, and as long as most of the investors do not demand full repayment and still believe in the non-existent assets they are purported to own.
The scheme is named after Charles Ponzi, who became notorious for using the technique in the 1920s.The idea had already been carried out from 1869 to 1872 by Adele Spitzeder in Germany and by Sarah Howe in Boston in the 1880s through the "Ladies' Deposit". Howe offered a solely female clientele an eight-percent monthly interest rate, and then stole the money that the women had invested. She was eventually discovered and served three years in prison. The Ponzi scheme was also previously described in novels; Charles Dickens' 1844 novel Martin Chuzzlewit and his 1857 novel Little Dorrit both feature such a scheme. Ponzi carried out this scheme and became well known throughout the United States because of the huge amount of money that he took in. His original scheme was based on the legitimate arbitrage of international reply coupons for postage stamps, but he soon began diverting new investors' money to make payments to earlier investors and to himself.Population pyramid
A population pyramid, also called an "age-sex- pyramid", is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing. Males are conventionally shown on the left and females on the right, and they may be measured by raw number or as a percentage of the total population. This tool can be used to visualize and age of a particular population. It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species.Pyramid (game show)
Pyramid is an American television game show franchise that has aired several versions domestically and internationally. The original series, The $10,000 Pyramid, debuted March 26, 1973, and spawned seven subsequent Pyramid series. Most later series featured a full title format matching the original series, with the title reflecting the top prize increase from $10,000, $20,000, $25,000, $50,000 to $100,000 over the years. The game features two contestants, each paired with a celebrity. Contestants attempt to guess a series of words or phrases based on descriptions given to them by their teammates. The title refers to the show's pyramid-shaped gameboard, featuring six categories arranged in a triangular fashion. The various Pyramid series have won a total of nine Daytime Emmys for Outstanding Game Show, second only to Jeopardy!, which has won 13.
Dick Clark is the host most commonly associated with the show, having hosted every incarnation from 1973 to 1988, with the exception of the original version of The $25,000 Pyramid, which aired in weekly syndication from 1974 until 1979 and was hosted by Bill Cullen. The $100,000 Pyramid was revived for a brief 1991 run with John Davidson hosting. In 2002 the series was revived as simply Pyramid, with Donny Osmond hosting for two seasons. GSN's The Pyramid was hosted by Mike Richards and aired for a single forty-episode season in 2012.
A revival of The $100,000 Pyramid debuted June 26, 2016, on ABC with Michael Strahan as host. The Strahan version has been renewed for a fourth season.Pyramid (geometry)
In geometry, a pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base. A pyramid with an n-sided base has n + 1 vertices, n + 1 faces, and 2n edges. All pyramids are self-dual.
A right pyramid has its apex directly above the centroid of its base. Nonright pyramids are called oblique pyramids. A regular pyramid has a regular polygon base and is usually implied to be a right pyramid.When unspecified, a pyramid is usually assumed to be a regular square pyramid, like the physical pyramid structures. A triangle-based pyramid is more often called a tetrahedron.
Among oblique pyramids, like acute and obtuse triangles, a pyramid can be called acute if its apex is above the interior of the base and obtuse if its apex is above the exterior of the base. A right-angled pyramid has its apex above an edge or vertex of the base. In a tetrahedron these qualifiers change based on which face is considered the base.
Pyramids are a class of the prismatoids. Pyramids can be doubled into bipyramids by adding a second offset point on the other side of the base plane.Pyramid scheme
A pyramid scheme is a business model that recruits members via a promise of payments or services for enrolling others into the scheme, rather than supplying investments or sale of products. As recruiting multiplies, recruiting becomes quickly impossible, and most members are unable to profit; as such, pyramid schemes are unsustainable and often illegal.
Pyramid schemes have existed for at least a century in different guises. Some multi-level marketing plans have been classified as pyramid schemes.Russian pyramid
Russian pyramid, also known as Russian billiard (Russian: ру́сский билья́рд, russky bilyard, French: billard russe) is a form of pocket billiards played on a table similar to a snooker table. It is popular across Eastern Europe as well as countries of the former Soviet Union/Eastern Bloc. A variant with colored balls modeled on those of pool is known as Russian pool. In Western countries, the game is known as pyramid billiards, or simply pyramid within professional circle.
Russian pyramid is considered to be one of the most difficult billiards games.Thyroid
The thyroid gland, or simply the thyroid, is an endocrine gland in the neck, consisting of two lobes connected by an isthmus. It is found at the front of the neck, below the Adam's apple. The thyroid gland secretes three hormones, namely the two thyroid hormones (thyroxine/T4 and triiodothyronine/T3), and calcitonin. The thyroid hormones primarily influence the metabolic rate and protein synthesis, but they also have many other effects, including effects on development. Calcitonin plays a role in calcium homeostasis.Hormonal output from the thyroid is regulated by thyroid-stimulating hormone (TSH) secreted from the anterior pituitary gland, which itself is regulated by thyrotropin-releasing hormone (TRH) produced by the hypothalamus.The thyroid may be affected by several diseases. Hyperthyroidism occurs when the gland produces excessive amounts of thyroid hormones, the most common cause being Graves' disease, an autoimmune disorder. In contrast, hypothyroidism is a state of insufficient thyroid hormone production. Worldwide, the most common cause is iodine deficiency. Thyroid hormones are important for development, and hypothyroidism secondary to iodine deficiency remains the leading cause of preventable intellectual disability. In iodine-sufficient regions, the most common cause of hypothyroidism is Hashimoto's thyroiditis, also an autoimmune disorder. In addition, the thyroid gland may also develop several types of nodules and cancer.United States soccer league system
The United States soccer league system is a series of professional and amateur soccer leagues based, in whole or in part, in the United States. Sometimes called the American soccer pyramid, teams and leagues are not linked by the system of promotion and relegation typical in soccer elsewhere. Instead, the United States Soccer Federation (USSF) defines professional leagues in three levels, called divisions, with all other leagues sanctioned by USSF not having an official designated level or division.
For practical and historical reasons, some teams from Antigua and Barbuda, Bermuda, Canada, and Puerto Rico (considered a separate country by FIFA) can also compete in these leagues. However, these teams are not eligible for the U.S. Open Cup and cannot represent the United States in the CONCACAF Champions League because they are not affiliated with U.S. Soccer.