Stamp

A stamp is an object used to impress an ink or paint image onto another object, or to impress a seal or signet onto melted wax when sealing a message in parchment to send to someone else. It can also refer to a postage stamp, which is a small piece of paper with an adhesive that is used for sending mail to somebody, usually to defray the cost of its transport.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, humans use signets as their stamps when sealing messages to be sent to other people.