emblem vs pictogram

emblem

noun
  • 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. 

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

pictogram

noun
  • A picture that represents a word or an idea by illustration. 

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