はんこ判子hanko
1.

A small carved object used for marking documents, often affixed with ink to symbolize agreement or authorization.

2.

A traditional stamp used in place of a signature to validate or authenticate papers, commonly featuring the owner's name in stylized characters.

3.

A custom-made mark that serves as an official identifier, typically made of wood or stone, and used in various official contexts, such as contracts and legal documents.