žig

1. stamp; postmark; hallmark
   Na koverti se vidi poštanski žig iz Novog Sada. — The envelope has a Novi Sad postmark on it.
2. (on an animal) brand
   Svaka krava na farmi ima žig na butu. — Every cow on the farm has a brand on its thigh.
3. stigma; mark
   Rat je ostavio žig na celoj generaciji. — The war left its mark on a whole generation.
4. (in law, business) trademark
   Kompanija je registrovala svoj žig u Zavodu za intelektualnu svojinu. — The company registered its trademark with the Intellectual Property Office.

For an official stamp on documents «pečat» is more common.