君 is built from the ヨ (pig's snout / hand), 丿 (slash / sweep), and 口 components.
It belongs to a phonetic family with 郡 and 群 — they share the 君 component and the reading クン.
A common word using 君 is 君 (きみ), meaning “you (informal for men)”.
Kanji that look similar include 争, 伊, 当, and 侵.