cachet

(kă-shāˈ)

1. A mark or quality, as of distinction, individuality, or authenticity: “Federal courts have a certain cachet which state courts lack” (Christian Science Monitor).
2. A seal on a document, such as a letter.
3. a. A commemorative design stamped on an envelope to mark a postal or philatelic event.
   b. A motto forming part of a postal cancellation.
4. A kind of wafer capsule formerly used by pharmacists for presenting an unpleasant-tasting drug.