認

Phono-semantic compound:

言 (“speech, words”) — semantic element, indicating communication and expression.

忍 (to endure, restrain) — phonetic element.

Thus, 認 originally denoted “to know by word / through acknowledgment,” extending to recognition, admission, or acceptance.

認識 (인식) — recognition, awareness, cognition

認定 (인정) — designation, certification; acknowledgment

確認 (확인) — confirmation, verification

承認 (승인) — approval, ratification

認錯 (인착) — to admit a fault, confess an error