Five non-Han people, namely: Huns or Xiongnu 匈奴[Xiong1 nu2], Xianbei 鮮卑|鲜卑[Xian1 bei1], Jie 羯[Jie2], Di 氐[Di1], Qiang 羌[Qiang1], esp. in connection with the Sixteen Kingdoms 304-439 五胡十六國|五胡十六国[Wu3 hu2 Shi2 liu4 guo2]
Definitions (Wiktionary)
name
the Five Barbarians (the ethnic groups Xiongnu (匈奴), Xianbei (鮮卑), Di (氐), Qiang (羌), Jie (羯), regarded as barbarians by the Chinese)