Stamp is a tool whose surface is engraved pictures, writings or both that can produce a stamp. There are things to note if a stamp is made, ie the engraving on the surface must be made upside down to produce a cap as desired.
Stamp are generally made of harsh materials. For example of metal or semi-precious stones. Other elastic materials such as rubber can also be used. The shape of a stamp surface is generally round or oval, but there is also a rectangle of long, square, octagonal, and others.