E-COM - an acronym for Electronic Computer-Originated Mail. The service began in 1982, years before widespread private Internet use. It allowed individuals to send a message electronically between post offices, with a hard copy provided to recipient by the receiving post office. The service ended in 1985.
Electric eye perforation - a type of perforation equipment. An electronically-controlled mechanical device acts as a guide in the operation of the perforating machine. Short, colored dashes are printed on the stamp sheet margins to activate the perforation machine.
Embossing - the process of giving relief to paper by pressing it with a die. Embossed designs are often found on the printed stamps of postal stationery. Selected stamps of certain countries have been embossed.
Engraving - a method whereby ink is carried in depressions below the surface of the plate, and from there transferred to the paper. Engraving is usually done by hand directly on wood or a steel die. Some dies are produced by etching the metal with acid, which creates depressions in the exposed area to form the design.