WordWeb Online

1. A card that is used instead of cash to make telephone calls
   - phone card
    
2. A printed or written greeting that is left to indicate that you have visited
   - visiting card, card
    
3. A distinguishing characteristic or behaviour
   "bombs are a terrorist's calling cards"

Derived forms: calling cards

Type of: charge card, charge plate, credit card, distinctive feature, distinguishing characteristic, greeting, peculiarity, plastic, salutation

Encyclopedia: Calling card