Tekka is a synonym of higisho (taking of a religious oath with red-hot iron), and trials held according to higisho is called 'tekka saiban' or 'tekka no saiban' (literally, 'red-hot iron trial,' in which one grabbed a red-hot iron bar to make a judgment based on the appearance of the burn on the hand).
鉄火とは、火起請（ひぎしょう）ともいい「鉄火裁判」や「鉄火の裁判」ともいわれる。