卅 卅 sa4
thirty

strokes 4
radical
十
十
strokes after radical 2
五卅 五卅 wu3 sa4
abbr. for 五卅運動|五卅运动, The May Thirtieth Movement (1925)

五卅运动 五卅運動 wu3 sa4 yun4 dong4
anti-imperialist movement of 30th May 1925, involving general strike esp. in Shanghai, Guangzhou, Hong Kong etc