・ 音 コウ
Sino-Vietnamese: hiệu
The 木 (wood) radical with 交 (to exchange, to mix): the wooden hall where people come and go to learn together.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
学校は九時に始まります。 (がっこうはくじにはじまります)
School starts at nine o'clock.