訓 かぎ(る),かぎ(り),-かぎ(り) ・ 音 ゲン
Sino-Vietnamese: hạn
Mound 阝 gives the meaning and 艮 the sound: a hill blocking the way forward, so it means limit (Han Viet han, as in han che = restrict).
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
参加者は二十人に限ります。 (さんかしゃはにじゅうにんにかぎります)
Participants are limited to twenty people.