失 means to lose and is a JLPT N3 kanji. It has 5 strokes and uses the big radical (大).
Stroke order · 5 strokes
On'yomi (音読み)
シツ
Kun'yomi (訓読み)
うしな(う)、う(せる)
Radical
大 · big
Strokes
5
How to remember 失
Something slipping out of a hand-like shape — losing means letting it slip from the hand. Japanese people say 失礼します and 'lose their rudeness' about ten times a day.