訓 とお ・ 音 ジュウ
Sino-Vietnamese: thập
A plus sign, or two hands crossed to show all ten fingers. It also sits inside 古 (old) and 千 (thousand).
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
十時に会議があります。 (じゅうじにかいぎがあります)
There is a meeting at ten o'clock.