X vs autograph

X

noun
  • Any mark that looks like that letter, such as a mark made by a person who cannot read or write in lieu of a signature. 

  • Cross, crossing. 

  • The spot behind the goal. 

  • Ecstasy, a particular street drug. 

character
  • The twenty-fourth letter of the English alphabet, called ex and written in the Latin script. 

name
  • A surname, used by those who have had their identity or heritage, including their proper ancestral names, erased or forgotten. 

  • Christ 

  • A placeholder for an unknown, suppressed or hypothetical name. 

adj
  • Obscene. 

  • Intersex or non-binary (in passports and identification documents). 

num
  • An unknown quantity or unknown value. 

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. 

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

  • Written in the author’s own handwriting. 

verb
  • To write something in one's own handwriting 

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

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