registered trademark vs rune

registered trademark

noun
  • A trademark that has been officially registered with the government by its owner. Indicated by the symbol ®. 

rune

noun
  • A letter or mark used as a mystical or magic symbol. 

  • A letter, or character, used in the written language of various ancient Germanic peoples, especially the Scandinavians and the Anglo-Saxons. 

  • A Finnish or Scandinavian epic poem, or a division of one, especially a division of the Kalevala. 

  • A verse or song, especially one with mystical or mysterious overtones; a spell or an incantation. 

  • A Unicode code point. 

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