单于 Traditional form: 單于 Pinyin (reading): chányú Definitions: king of the Xiongnu 匈奴 ( Xiōngnu) Characters: 单 - single, individual, only; lone 于 - at, in, on; to, from; alas! Traditional characters: 單 - single, individual, only; lone 于 - at, in, on; to, from; alas!