ESA: Extreme Sigma Associate 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)

ESA is the 5 sigma intelligence (1:3,500,000) society of the United Sigma Intelligence Association. ESA members qualified for the full membership are conferred the title of Fellow of ESA Society and USIA.