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A high IQ society is an organization that limits its membership to people who are within a certain high percentile of Intelligence quotient (IQ) test results. The oldest, largest, and most well-known such society is Mensa International, which was founded by Roland Berrill and Dr. Lancelot Ware in 1946. Other early societies were Intertel (founded by Ralph Haines in 1966), the International Society for Philosophical Enquiry (founded by Dr. Christopher Harding in 1974) and Prometheus Society (founded by Dr. Ronald K. Hoeflin in 1982).

Entry requirements
High IQ societies typically accept a variety of standardized intelligence tests such as the Stanford-Binet test, WAIS-III (for adults) or WISC-IV (for children) and Cattell Culture Fair III test. Some conduct proprietary or alternative tests to determine membership eligibility. A brief description of those notable societies with an appreciable membership size compared to their cutoff, comprise the following data:


 * Top 5% (95th percentile; 1/20; IQ 124 sd15, IQ 126 sd16): International High IQ Society
 * Top 2% (98th percentile; 1/50; IQ 130 sd15, IQ 132 sd16): Mensa International, Mysterium Society, Encefálica
 * Top 1% (99th percentile; 1/100; IQ 135 sd15, IQ 137 sd16): Intertel, Top One Percent Society,
 * Top 0.7% (99.3rd percentile; 1/147; IQ 137 sd15): Sunesis Society (Christianity themed)
 * Top 0.5% (99.5th percentile; 1/200; IQ 139 sd15, IQ 141 sd16): Colloquy, Poetic Genius Society
 * Top 0.3% (99.7th percentile; 3/1000; IQ 141 sd15, IQ 144 sd16): Cerebrals Society
 * Top 0.2% (99.8th percentile; 1/500; IQ 143 sd15, IQ 146 sd16): ePiq Society
 * Top 0.13% (99.87th percentile; 13/10000; IQ 145 sd15, IQ 148 sd16): CIVIQ Society
 * Top 0.1% (99.9th percentile; 1/1000; IQ 146 sd15, IQ 149 sd16): International Society for Philosophical Enquiry, Triple Nine Society
 * Top 0.09% (99.91th percentile; 9/10000; IQ 147 sd15, IQ 150 sd16): Glia Society, One-in-a-Thousand Society
 * Top 0.003% (99.997th percentile; 3/100000; IQ 160 sd15, IQ 164 sd16): Prometheus Society, Epimetheus Society, Platinum Society
 * Top 0.001% (99.999th percentile; 1/100000; IQ 164 sd15, IQ 168 sd16): The Ultranet
 * Top 0.0001% (99.9999th percentile; 1/1000000; IQ 172 sd15, IQ 176 sd16): Mega Society, Mega International, Pi Society, Omega Society


 * Variable entry conditions: Sigma Society (Sigma, Sigma III, Sigma IV, Sigma V, Sigma VI)

Testing Difficulties
The ceiling of most standardized (validated and normed) intelligence tests is at around 99.9th percentile. Measurements above 99.9999th percentile are rather doubtful as no sufficient correlation studies and normings are available.

Differences, characteristics
Many high IQ societies have specific areas of interest, like creativity (ISI-Society and Vinci Society), social activities (International High IQ Society, Mensa International), poetry (Poetic Genius Society), music (Chorium), contributions to humanity (International Society for Philosophical Enquiry), Christianity and Religion (Sunesis Society), broad and frequented discussion-boards (Cerebrals Society, Civiq Society, ePiq Society, Milenija, Prometheus Society, Camp Archimedes (see below), Triple Nine Society, The Ultranet), Mathematics and Physics (Milenija, Pi Society, GenerIQ Society), Spanish-speaking individuals (Altacapacidadhispana, Neurocubo, Elateneo/s). Another society, The Lateral Line, exists as an influential high IQ assessment group tasked with advising American, British and Swiss government departments, together with The World Bank, on global economic and social projections.

Some high IQ societies and organisations offer public areas in their boards where also non-members may participate (e.g. Cerebrals Society, Mega Foundation, World Intelligence Network, Milenija).

Two organisations represent a network with several independent high IQ societies:
 * Mega Foundation: with The Ultranet and Mega International Society
 * World Intelligence Network (WIN): with Colloquy Society, ePiq Society, Civiq Society, ISI-Society, Helliq Society, Pars Society, Olympiq Society and Giga Society.