THESAURUS
initials
ID card, John Hancock, X, autograph, badge, calligram, calling card, card, christcross, cipher, countermark, countersign, countersignature, counterstamp, credentials, cross, device, dog tag, endorsement, hand, identification, identification badge, identification tag, letter of introduction, mark, mark of signature, monogram, press card, seal, serial number, sigil, sign manual, signature, signet, subscription, tessera, visa, vise, visiting card