Esoteric Sigma Intelligence Society (Experimental)


≥ 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 high intelligence society of the United Sigma Intelligence Association. A member qualified for the full membership of the ESI Society is awarded the Fellowship (Honours) of the USIA. For the membership of ESI Society, please send the application to