12 vs twelve

12

noun
  • Collectively, police or law enforcement. 

  • See also: fuck 12 

symbol
  • Used by fans of American football, positioning themselves as the 12th member of an 11-player team. 

twelve

noun
  • The police; law enforcement, especially a narcotics officer. 

  • A jury (normally composed of twelve persons). 

  • A twelve-bore gun. 

  • Front (front side of something, position in front of something). 

  • A group of twelve items. 

num
  • The cardinal number occurring after eleven and before thirteen, represented in Arabic numerals as 12 and in Roman numerals as XII. 

How often have the words 12 and twelve occurred in a corpus of books? (source: Google Ngram Viewer )