emblem vs guidon

emblem

noun
  • A representative symbol, such as a trademark or logo. 

  • A picture accompanied with a motto, a set of verses, etc. intended as a moral lesson or meditation. 

  • Inlay; inlaid or mosaic work; something ornamental inserted in a surface. 

  • Something that represents a larger whole. 

guidon

noun
  • A soldier assigned to carry such a banner. 

  • A small pennant or banner carried by infantry soldiers to direct troop movement. 

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