In
philately
Philately (; ) is the study of postage stamps and postal history. It also refers to the collection and appreciation of stamps and other philatelic products. Philately involves more than just stamp collecting or the study of postage; it is poss ...
, a line pair is a
coil pair of
postage stamp
A postage stamp is a small piece of paper issued by a post office, postal administration, or other authorized vendors to customers who pay postage (the cost involved in moving, insuring, or registering mail), who then affix the stamp to the fa ...
s bearing an inked line between the two stamps. There are at least two kinds of these:
*A guide line pair has a
guide line
A distance line, penetration line, cave line or guide line is an item of diving equipment used by Scuba diving, scuba divers as a means of returning to a safe starting point in conditions of low visibility, water currents or where pilotage is di ...
between the stamps. Since the guide lines are deliberately incised into the plate, they will generally be sharp and clear.
*A joint line pair has a
joint line between the stamps, deriving from the seam in the cylindrical plate used to print the stamps. These lines are somewhat smeared in appearance.
{{DEFAULTSORT:Line Pair
Philatelic terminology