三 means three and is a JLPT N5 kanji. It has 3 strokes and uses the one / horizontal stroke radical (一).
Stroke order · 3 strokes
On'yomi (音読み)
サン、ゾウ
Kun'yomi (訓読み)
み、み(つ)、みっ(つ)
Radical
一 · one / horizontal stroke
Strokes
3
How to remember 三
Three strokes. After one and two, you could guess this one. The good news is that four isn't four strokes — that's where the Japanese changed the rule.