term used by the <#usps=United States Postal Service> for stamps intended for use on mail.

a perforating device included in the mechanized portion of a printing press, automatically activated as the printed <#web> or <#sheet=sheets> pass through the station.

work-horse perforator at the <#bep=BEP> for definitive sheet <#stamp=stamps> during the late 1980s and beyond.  Introduced in February 1985, this machine uses a Eureka <#bullseyeperforations=bullseye perforation> die to perforate two adjoining <#pane=panes> across a printed <#web> at a time.  It also separated the web into <#sheet=sheets> four panes square then stacked them.

a popular color matching system used by the printing industry to print spot colors.  Most applications that support color printing allow specification of colors by indicating the Pantone name or number.

a plate with pins that perforates a complete <#sheet> or <#pane> of <#stamp=stamps> with a single stroke.  Its name comes from its resemblance to the farming implement of the same name.