accent mark vs check mark

accent mark

noun
  • A mark or character used in writing, in order to indicate the place of the spoken accent, or to indicate the nature or quality of the vowel marked. 

  • A prime symbol. 

  • A mark used to represent specific stress on a note. 

  • A mark placed after a letter designating a note of music to indicate the octave in which it occurs. 

check mark

noun
  • A mark (✓) made to indicate agreement, correctness or acknowledgement. 

  • In long jump, javelin and similar events, little mark alongside the runway which helps the athlete to set their steps just right for their performance. 

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