Official flag used by the Fédération Internationale de Football Association (FIFA) to represent Chinese Taipei in association football matches. Also used at the Olympics from 1986 to 2010.
From the FIFA's member association page of Chinese Taipei (larger version here) (archive link)
Mrmw and S.A. Julio (derived from File:Flag of Chinese Taipei for Olympic games.svg, authored by Pixeltoo, and File:Chinese Taipei Football Flag on FIFA website.svg, authored by B1mbo)