SM vs belting

SM

symbol
  • service mark 

belting

adj
  • Very good; exceptional (can also be used adverbially) 

noun
  • A beating with a belt. 

  • A thorough defeat; a thrashing. 

  • The material from which belts for machinery are made. 

  • A system of beltwork, as in a conveyor or other mechanical device. 

  • The act of singing in chest voice above one's vocal break in a higher range typically sung in head voice. 

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