籍 means registry, enrollment and is a JLPT N2 kanji. It has 20 strokes and uses the bamboo radical (竹).
Stroke order · 20 strokes
On'yomi (音読み)
セキ
Kun'yomi (訓読み)
—
Radical
竹 · bamboo
Strokes
20
How to remember 籍
Having your name entered on a bamboo (竹) slat — getting listed in the register. 国籍 (nationality) — an inevitable field on any form; 書籍 (books) — the kanji of book fairs.