監 is built from the 臣, 𠂊 (claw / hand (top of 色·危)), 一, and 皿 components.
It belongs to a phonetic family with 艦 and 鑑 — they share the 監 component and the reading カン.
A common word using 監 is 監督 (かんとく), meaning “supervision, control, (movie) director”.
Kanji that look similar include 緊, 賢, and 覧.