Refers to the thin, curved shape of the moon in its early phases. Often used poetically or in descriptive contexts.
今夜は三日月がきれいだ。
The crescent moon is beautiful tonight.
三日月の形をしたパンを焼いた。
I baked bread shaped like a crescent moon.
A crescent moon was out in the night sky.
She has eyes shaped like a crescent moon.
golden spadefish; Boer's batfish