Peen may refer to: * Part of the head of a hammer, as in a

ball-peen hammer A ball-peen or ball pein hammer, also known as a machinist's hammer, is a type of peening hammer used in metalworking. It has two heads, one flat and the other, called the peen, rounded. It is distinguished from a cross-peen hammer, diagonal-peen ...

(also ''ball-pein'', or ''ball and pein'') *

Peening In metallurgy, peening is the process of working a metal's surface to improve its material properties, usually by mechanical means, such as hammer blows, by blasting with shot (shot peening), or focusing light ( laser peening). Peening is norm ...

, the changing of a metal's properties by impacting its surface **

Shot peening Shot peening is a cold working process used to produce a compressive residual stress layer and modify the mechanical properties of metals and composites. It entails striking a surface with shot (round metallic, glass, or ceramic particles) with ...

, bombarding metal parts with small spherical media ** Laser peening, focusing lasers on the surface of a metal part * Peening (scythe blade), peening a scythe or sickle blade as a step in sharpening it * Steel Belt: Shot Peening, an innovative remedial solution for deformed steel belts *A slang term for the

penis A penis (plural ''penises'' or ''penes'' () is the primary sexual organ that male animals use to inseminate females (or hermaphrodites) during copulation. Such organs occur in many animals, both vertebrate and invertebrate, but males d ...

See also