Origin unclear. Various explainations include (1) possibly derives from 入 (enter), with two strokes on the bottom to distinguish it from 入 (enter) or (2) a pictograph of a hut, which is thought to be the original form of 廬. Either way, the current meaning is a phoentic loan.
Shuowen Jiezi
《說文》:“六,《易》之數,陰變於六,正於八。从入,从八。”
Example sentences
他年近六十。 — He is close to sixty.
他们差六岁。 — The difference in their ages is six years.