夕 Radical 36 — evening, dusk; nightfall
xī (first tone, high and level)
evening, dusk; nightfall
Radical 363 strokes1 characters
Where the shape comes from
The crescent moon 月 with one of its inner strokes rubbed out: the moon barely showing, at the hour when the light goes. It marks the end of the day and what belongs to it: 多, 外, 名, 夜, 梦.