1.
revenue stamp
A government-issued stamp bought at post offices and convenience stores and stuck on certain documents, such as receipts over 50,000 yen and contracts, to pay the stamp duty on them, or used to pay fees for applications.
Cultural note
The stamp is stuck on the document and then cancelled by stamping a seal or signing across its edge (消印), so that it cannot be reused. Electronic contracts need no stamp, which is one reason businesses have moved to them.