Meaning : A card that is used instead of cash to make telephone calls.
Synonyms : phone card
Meaning : A printed or written greeting that is left to indicate that you have visited.
Synonyms : card, visiting card
Meaning : A distinguishing characteristic or behavior.
Example :
Bombs are a terrorist's calling cards.
Calling card ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Calling card ka matlab kya hota hai?