Northern Di; northern barbarians
Historical term from the Zhou dynasty referring to non-Chinese ethnic groups to the north. Often used in classical Chinese contexts and may carry a pejorative nuance.
The Zhou dynasty was troubled by incursions of the Northern Di.
'Hokuteki' is a term that referred to northern non-Chinese peoples in ancient China.
From Chinese 北狄 (běidí), literally 'northern Di', where 北 means 'north' and 狄 refers to non-Chinese tribes. The term is deeply rooted in classical Chinese historiography and ethnocentrism.