The ESI: Esoteric Sigma Intelligence Society


≥ IQ 175 (S.D. 15, Wechsler Scale)
IQ 180 (S.D. 16, Stanford-Binet Scale)
≥ IQ 220 (S.D. 24, Cattell Scale)
≥ IQ 220 (S.D. 24, Mensa Korea Scale)

The ESI is the 5 sigma intelligence (1:3,500,000) society of the United Sigma Intelligence Association. ESI members qualified for the full membership are awarded the title of Fellow of ESI and USIA. For the membership of ESI Society, please send the application to