minus vs plus sign

minus

noun
  • The minus sign (−). 

  • A negative quantity. 

  • A downside or disadvantage. 

verb
  • To subtract. 

adj
  • Being a negative quantity; pertaining to a deficit or reduction. 

  • That is below zero by (a specified amount) on a scale. 

  • Ranking just below (a designated rating). 

prep
  • Made less or reduced by (followed by an expression of number or quantity). 

  • Without; deprived of. 

plus sign

noun
  • The symbol + used to denote the operation of addition, to indicate that a number is positive, and so on. 

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