certification stamp; inspection stamp
An official stamp or sticker affixed to documents, products, or packages to indicate that they have passed inspection or meet certain standards. Often used in administrative, customs, or quality control contexts.
税関で証紙を貼られた。
A certification stamp was affixed at customs.
この製品に
This product has an inspection stamp attached.
Compound of 証 (proof, certification) and 紙 (paper), literally 'certification paper'.