Synonyms:
- 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