A high-IQ society is an organization that limits its membership to people who have attained a specified score on an IQ test, usually in the top two percent of the population (98th percentile) or above.[1][2] These may also be referred to as genius societies.[1][3] The largest and oldest such society is Mensa International, which was founded by Roland Berrill and Lancelot Ware in 1946.[4][5]