Japanese Kanji
窬yu
small door or window · hole in the wall · to cut through a wall
Extended kanji · 14 strokes
Small door or window, hole in the wall, to cut through a wall, dig or bore hole.
窬 is a Extended kanji — used in Japanese names and specialised writing. With 14 strokes, it appears in classical literature, place names, and formal documents.
Start with hiragana and katakana — the foundation of Japanese reading.