noun plural
1. : a set of initials (as a business monogram) or other design pierced into a postage stamp as a means of identification or as a safeguard against theft
2. : stamps having perforated initials
noun plural
1. : a set of initials (as a business monogram) or other design pierced into a postage stamp as a means of identification or as a safeguard against theft
2. : stamps having perforated initials
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012