insignia vs registered trademark

insignia

noun
  • A symbol or token of personal power, status, or office, or of an official body of government or jurisdiction. 

  • A patch or other object that indicates a person's official or military rank, or membership in a group or organization. 

  • A mark or token by which anything is known. 

registered trademark

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

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