矩尺 Traditional form: 矩尺 Pinyin (reading): jǔchǐ Definitions: set square (tool to measure right angles) Characters: 矩 - carpenter's square, ruler, rule 尺 - ruler, tape-measure; unit of length, about 1 ft. Traditional characters: 矩 - carpenter's square, ruler, rule 尺 - ruler, tape-measure; unit of length, about 1 ft.