A Stamp

An act of stamping the foot, paw or hoof.
An indentation, imprint, or mark made by stamping.
A device for stamping designs.
A small piece of paper, with a design and a face value, used to prepay postage or other dues such as tax or licence fees.
A small piece of paper bearing a design on one side and adhesive on the other, used to decorate letters or craft work.
(slang, figuratively) A tattoo.
(slang) A single dose of lysergic acid diethylamide.
A kind of heavy pestle, raised by water or steam power, for crushing ores.
Cast; form; character; distinguishing mark or sign; evidence.

(paper used to indicate payment has been paid): postage stamp, revenue stamp, tax stamp