惜 means regrettable; precious and is a JLPT N1 kanji. It has 11 strokes and uses the heart (side form) radical (忄).
Stroke order · 11 strokes
On'yomi (音読み)
セキ
Kun'yomi (訓読み)
お(しい)
Radical
忄 · heart (side form)
Strokes
11
How to remember 惜
A pull in the heart (忄) toward days gone by (昔) — hard to let go. 惜しい! is what you shout in a quiz for 'ugh, so close!'; also for a missed shot in football!