brandmark vs logotype

brandmark

noun
  • The logo of a brand 

verb
  • To name or mark by branding; to give a brandmark to. 

logotype

noun
  • A symbol or emblem that acts as a trademark or a means of identification of an institution or other entity, usually referred to as a logo. 

  • A single type combining two or more letters (as a ligature or otherwise). 

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