M vs nautical mile

M

noun
  • the number of minutes a player spent at the crease 

  • Monsieur 

  • A film with the content rating M. 

  • the number of maiden overs bowled 

character
  • The thirteenth letter of the English alphabet, called em and written in the Latin script. 

name
  • Michigan. 

nautical mile

noun
  • A unit of length corresponding approximately to one minute of arc of latitude along any meridian. By international agreement it is exactly 1,852 metres (approximately 6,076 feet or 1.151 statute mile). 

  • Synonym of sea mile, a historical Scandinavian unit of distance equal to about 4 nmi. 

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