直尺 Traditional form: 直尺 Pinyin (reading): zhíchǐ Definitions: straight ruler Characters: 直 - straight, vertical; candid, direct, frank 尺 - ruler, tape-measure; unit of length, about 1 ft. Traditional characters: 直 - straight, vertical; candid, direct, frank 尺 - ruler, tape-measure; unit of length, about 1 ft.