Cachet

an official seal, as on a letter or document.
a distinguishing mark or feature; stamp:
Courtesy is the cachet of good breeding.
a sign or expression of approval, especially from a person who has a great deal of prestige.
superior status; prestige:
The job has a certain cachet.
Pharmacology. a hollow wafer for enclosing an ill-tasting medicine.
Philately. a firm name, slogan, or design stamped or printed on an envelope or folded letter.
Contemporary Examples

Tesla’s Rise Forces Other Automakers to Up Their Electric Car Game Daniel Gross September 24, 2013
Sorry, Michele Bachmann. We Are Ready for a Female President. And It’s Partially Because of You. Eleanor Clift February 20, 2014
MSNBC’s Earliest Star Lloyd Grove July 20, 2009
How to Pick a Book Prize Jane Ciabattari January 21, 2011
Is J.J. Abrams Too Big for TV? Jace Lacob November 6, 2010

Historical Examples

Castles and Chateaux of Old Navarre and the Basque Provinces Francis Miltoun
Alone Norman Douglas
Men’s Wives William Makepeace Thackeray
The Impostor Harold Bindloss
A Wanderer in Paris E. V. Lucas

noun
an official seal on a document, letter, etc
a distinguishing mark; stamp
prestige; distinction
(philately)

a mark stamped by hand on mail for commemorative purposes
a small mark made by dealers and experts on the back of postage stamps Compare overprint (sense 3), surcharge (sense 5)

a hollow wafer, formerly used for enclosing an unpleasant-tasting medicine
n.