notation vs symbology

notation

noun
  • A system of characters, symbols, or abbreviated expressions used in an art or science or in mathematics or logic to express technical facts or quantities. 

  • This section lists all algebraic notation used in this book. (Using notations would be incorrect). 

  • The act, process, method, or an instance of representing by a system or set of marks, signs, figures, or characters. 

  • A specific note or piece of information written in such a notation. 

symbology

noun
  • The study or use of symbols. 

  • An encoding scheme, particularly for barcodes. 

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