宵 means “evening, early night”

よい · yoi

Also: wee hours

Kun'yomi (Japanese reading)
よい
On'yomi (Chinese reading)
ショウ

JLPT N1 · Taught in secondary school · 10 strokes

The story

Under a roof (宀), a small (⺌) moon (月): the first thin moonlight of evening, seen from the eaves. 宵 is early night: 今宵 is tonight in songs and poems, a 宵っ張り is a night owl, and 宵山 are the festive evenings before Kyoto's Gion parade.

Used in 今宵 (koyoi, tonight), 宵っ張り (yoippari, night owl), and 宵山 (yoiyama, festival eve)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.