曲尺 Traditional form: 曲尺 Pinyin (reading): qūchǐ Definitions: set square (tool to measure right angles) Characters: 曲 - crooked, bent; wrong, false 尺 - ruler, tape-measure; unit of length, about 1 ft. Traditional characters: 曲 - crooked, bent; wrong, false 尺 - ruler, tape-measure; unit of length, about 1 ft.