inscription vs sig

inscription

noun
  • The act of inscribing. 

  • Text carved on a wall or plaque, such as a memorial or gravestone. 

  • Words written in the front of a book as a dedication. 

  • The text on a coin. 

sig

noun
  • A signature, especially on emails or newsgroup postings. 

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