autograph vs check mark

autograph

noun
  • A person's signature used as a mark of formal approval. 

  • A person’s own handwriting, especially the signature of a famous or admired person. 

  • A manuscript in the author’s handwriting. 

verb
  • To write something in one's own handwriting 

  • To sign, or write one’s name or signature on a book etc 

adj
  • Made by the artist himself or herself; authentic. 

  • Written in the author’s own handwriting. 

check mark

noun
  • A mark (✓) made to indicate agreement, correctness or acknowledgement. 

  • In long jump, javelin and similar events, little mark alongside the runway which helps the athlete to set their steps just right for their performance. 

How often have the words autograph and check mark occurred in a corpus of books? (source: Google Ngram Viewer )