calling card vs identification

calling card

noun
  • An attribute, symptom, object, or behavior which is distinctly characteristic of someone or something. 

  • A card advertising the services of a prostitute. 

  • Excrement, especially of a domestic animal. 

  • A small printed card which identifies the bearer, traditionally presented for introduction when making a social visit to a home or when attending a formal social event or business meeting. 

  • A phonecard. 

identification

noun
  • A feeling of support, sympathy, understanding, or belonging towards somebody or something. 

  • The combination of identifying (which one, which thing) and validating the identity (proving or confirming it); identifying and authenticating viewed as a unitary concept in cognition. 

  • A particular instance of identifying something. 

  • A document or documents serving as evidence of a person's identity. 

  • The act of identifying (i.e., which one, which thing). 

  • The state of being identified. 

How often have the words calling card and identification occurred in a corpus of books? (source: Google Ngram Viewer )