The TSI: Three Sigma Intelligence Society


≥ IQ 145 (S.D. 15, Wechsler Scale)
IQ 148 (S.D. 16, Stanford-Binet Scale)
≥ IQ 172 (S.D. 24, Cattell Scale)
≥ IQ 172 (S.D. 24, Mensa Korea Scale)

The TSI is the 3 sigma intelligence society of the United Sigma Intelligence Association. For the membership of TSI Society, please send the application to