余
yū · HSK 7
plus
💰 yū sounds like you-plus: whatever is left over after the round number, the surplus
余 marks a remainder tacked on: 十余 means ten-plus, ten and a bit more. The yū reading echoes the extra you keep beyond the even count.
余 — roof 亼 + wooden post/pillar
Originally a pictograph of a simple thatched shelter or hut supported by a central post, 余 meant 'lodging' or 'temporary dwelling.' It was later borrowed phonetically to write the first-person pronoun 'I/me,' which became its dominant meaning. The 'surplus/remainder' sense developed through its use as a loan for 餘.