无理数 Traditional form: 無理數 Pinyin (reading): wúlǐshù Definitions: irrational number Characters: 无 - no, not; lacking, -less 理 - science, reason, logic; to manage 数 - count, number, several Traditional characters: 無 - no, not; lacking, -less 理 - science, reason, logic; to manage 數 - count, number, several