調印
ちょういん · chouin · JLPT N1 · noun
signature
🖋️ 調 (prepare) + 印 (seal): prepare and seal a document = signing
印 is the seal Japanese people stamp on official papers, so 調印 is the formal act of signing and sealing a treaty or agreement.
印 — hand 爪 (claw) + kneeling person 卩
Originally a pictograph showing a hand pressing down on a kneeling figure, depicting the act of stamping or sealing. The meaning extended from 'to press a seal' to the seal itself, and then to 'print' or 'imprint' in modern usage.