雨天
うてん · uten · JLPT N1 · noun
weather
雨 — pictograph: sky 一 + cloud 冂 + four water drops
雨 is a pictograph showing rain falling from a cloud under the sky. The top horizontal stroke represents the sky, the enclosing shape depicts a cloud, and the four small strokes inside are falling raindrops. Its meaning 'rain' has stayed consistent since oracle bone script.
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.'