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, 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

See also