序号 Traditional form: 序號 Pinyin (reading): xùhào Definitions: ordinal number serial number sequence number Characters: 序 - order, sequence, series; preface 号 - mark, sign; symbol; number; to call, to cry, to roar Traditional characters: 序 - order, sequence, series; preface 號 - mark, sign; symbol; number; to call, to cry, to roar