航天员
háng tiān yuán · HSK 7
astronaut
👨🚀🚀 航 navigate + 天 sky + 员 staffer = one who navigates the heavens
航天 pairs 航 (to navigate or sail) with 天 (sky, heaven) to mean space flight; 员 marks a person filling a role, like the -er in worker. So a 航天员 is literally a sky-navigation crew member.
天 — 一 (one/sky) above 大 (big person)
Originally a pictograph of a person (大) with an emphasized head, representing what is above — the sky or heavens. The top stroke evolved into 一, symbolizing the vast expanse overhead. From 'sky' it extended to mean 'day,' 'heaven,' and 'nature.'
员 — mouth 口 + shell/money 贝 (貝)
Originally a pictograph of a round bronze tripod vessel, with 口 depicting its round opening and 鼎 (later simplified to 貝/贝) showing the vessel itself. The original sense was 'round,' now written 圓/圆. It was borrowed to mean 'member' or 'person in a role,' which became its main modern meaning.