懸 means to hang; to stake and is a JLPT N1 kanji. It has 20 strokes and uses the heart/mind radical (心).
Stroke order · 20 strokes
On'yomi (音読み)
ケン、ケ
Kun'yomi (訓読み)
か(ける)
Radical
心 · heart/mind
Strokes
20
How to remember 懸
The heart/mind (心) hanging by a thread — suspended. 一生懸命!!! — 'staking one's life' — the quintessential Japanese word for hard work; now you finally know its kanji!