五卅 Traditional form: 五卅 Pinyin (reading): wǔsà Definitions: abbr. for 五卅運動/五卅运动 (wǔsàyùndòng), The May Thirtieth Movement (1925) Characters: 五 - five; surname 卅 - thirty, thirtieth Traditional characters: 五 - five; surname 卅 - thirty, thirtieth