天国
てんごく · tengoku · JLPT N1 · noun
eden
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.'
国 — enclosure 囗 + jade 玉
国 is a simplified form of 國. The outer 囗 represents borders or an enclosed territory, while the inner 玉 (jade) suggests a treasured realm ruled by a sovereign. The traditional 國 used 或 inside, depicting a guarded region with a weapon, later simplified by replacing it with 玉.