Stencil
A stencil is a blocking material used to mask a surface. In it there are holes for ink or paint to pass through. That way an image is made on the material behind the stencil. Stencils are used when many copies are needed of the same image. It is used in street art, and many public notices.
Screen printing is a printing technique using a fine mesh. Ink is applied except in areas blocked by a stencil.
Stencil Media
Stenciled warning sign in Singapore
Stencilled Gaelic type
Japanese Ise-katagami stencil for printing textiles
Prehistoric hand stencils, Cueva de las Manos in Argentina
"Happy 1984" — Stencil graffiti found on the Berlin Wall in 2005. The object depicted is a DualShock video game controller.
Stencil used for identification (drum case at The Allman Brothers Museum)