A piece of card, plastic, metal, etc. into which shapes have been cut, used to draw or paint patterns onto a surface. (Cambridge Dictionary)
A picture made by drawing or paining through the holes in such a piece of card, etc. onto a surface. (Cambridge Dictionary)
A stencil is a piece of paper, plastic, or metal which has a design cut out of it. You place the stencil on a surface and paint it so that paint goes through the holes and leaves a design on the surface. (Collins Dictionary)
If you stencil a design or if you stencil a surface with a design, you put a design on a surface using a stencil. (Collins Dictionary)
Maori Style Sun Tattoo Stencil.
Family Tree Wall Stencil.