anomaly vs calling card

anomaly

noun
  • Something or someone that is strange or unusual. 

  • Any of various angular distances. 

  • A defect or malformation. 

  • A failure of a classical symmetry due to quantum corrections. 

  • Any event or measurement that is out of the ordinary regardless of whether it is exceptional or not. 

  • A deviation from a rule or from what is regarded as normal; an outlier. 

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. 

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