middle finger vs physical finger

middle finger

noun

  • The finger between the forefinger and the ring finger 

  • An obscene gesture directed towards another as an insult, made by sticking up the middle finger of a hand. 

  • An insult directed at someone. 

physical finger

noun

  • the ring finger 

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