匿 means “hide, shelter, anonymous”

とく · toku

Also: shield

Kun'yomi (Japanese reading)
かくまう
On'yomi (Chinese reading)
トク

JLPT N1 · Taught in secondary school · 10 strokes

The story

Someone young (若) tucked inside a three-sided hiding box (匸): sheltered from view. 匿名, a "hidden name", is anonymity, from online posts to anonymous donors, and to 匿う is to harbor someone on the run.

Used in 匿名 (tokumei, anonymity), 匿う (kakumau, to shelter/harbor), and 隠匿 (intoku, concealment)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.