also: クレッセント
crescent
Refers to the crescent shape, often used in design, astronomy, or as a symbol.
夜空に細いクレセントが見えた。
A thin crescent was visible in the night sky.
crescent lock
Specifically a crescent-shaped lock, commonly used on windows or sliding doors in Japan.
窓のクレセントを閉めてください。
Please lock the crescent lock on the window.