Synonyms and related words :
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