WIG, originally an acronym for Warszawski Indeks Gieldowy (Warsaw Stock Exchange Index) is the oldest index of the Warsaw Stock Exchange, introduced on the WSE's first trading session on 16 April 1991. WIG lists 318 companies (as of 5 February 2010).

A wig is a head of hair made from horsehair, human hair, wool, feathers, yak hair, buffalo hair, or synthetic materials which is worn on the head for fashion or various other aesthetic and stylistic reasons, including cultural and religious observance. The word wig is short for periwig and first appeared in the English language around 1675.