角尺 Traditional form: 角尺 Pinyin (reading): jiǎochǐ Definitions: set square (tool to measure right angles) Characters: 角 - angle, corner; horn, horn-shaped 尺 - ruler, tape-measure; unit of length, about 1 ft. Traditional characters: 角 - angle, corner; horn, horn-shaped 尺 - ruler, tape-measure; unit of length, about 1 ft.