Noun calling card has 3 senses
  1. calling card, phone card - a card that is used instead of cash to make telephone calls
    --1 is a kind of credit card, charge card, charge plate
  2. calling card, visiting card, card - a printed or written greeting that is left to indicate that you have visited
    --2 is a kind of greeting, salutation
  3. calling card - a distinguishing characteristic or behavior; "bombs are a terrorist's calling cards"
    --3 is a kind of
    peculiarity, distinctive feature, distinguishing characteristic
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