差 means difference and is a JLPT N3 kanji. It has 10 strokes and uses the work radical (工).
Stroke order · 10 strokes
On'yomi (音読み)
サ
Kun'yomi (訓読み)
さ(す)
Radical
工 · work
Strokes
10
How to remember 差
Sorting sheep's wool by size before putting it to work (工) — that's where difference comes from. 時差 (time-zone difference) — calculate it before calling home.