A coil stamp is a type of postage stamp

Postage stamp

A postage stamp is a small piece of paper that is purchased and displayed on an item of mail as evidence of payment of postage. Typically, stamps are made from special paper, with a national designation and denomination on the face, and a gum adhesive on the reverse side...

 sold in strips one stamp wide. The name derives from the usual handling of long strips, which is to coil them into rolls, in a manner reminiscent of adhesive tape

Adhesive tape

Adhesive tape is one of many varieties of backing materials coated with an adhesive. Several types of adhesives can be used.-Types:Pressure sensitive tape...

 rolls. A large percentage of modern stamps are sold in coil form, since they are more amenable to mechanized handling in large quantities than either sheet stamps or booklet stamp

Postage stamp booklet

A postage stamp booklet is a booklet made up of one or more small panes of postage stamps in a cardboard cover. Booklets are often made from sheets especially printed for this purpose, with a narrow selvedge at one side of the booklet pane for binding. From the cutting, the panes are usually...

s.

Coil stamps first appeared at the beginning of the 20th century.