In philately, labelSee examples on the sites and Stamps News and Stories. or coupon or tabKenmore Stamps. is a part of sheet of stamps separated from them with perforations (or a narrow margin in imperforate stamps). It cannot be used for postage because it does not have face value and any indication of a postal administration that issued such stamps with labels. The notion of label should not be confused with the term "gutter" or with a margin of a stamp sheet.
Sometimes, label is also a stamp-like adhesive of no postal value, often used for promotional purposes.Advanced Philatelic Glossary at findyourstampsvalue.com.Glossary of Terms for the Collector of United States Stamps , United States Stamp Society, Inc.
See also Adhesive label Gutter (philately)
References
Other websites
, AskPhil