acronym vs symbol

acronym

verb
  • To form into an acronym. 

noun
  • An abbreviation formed by the beginning letters or syllables of other words (as "Benelux"). 

  • An abbreviation formed by the initial letters of other words, sometimes exclusively such abbreviations when pronounced as a word (as "laser") rather than as individual letters (initialisms such as "TNT"). 

symbol

verb
  • To symbolize. 

noun
  • A type of noun whereby the form refers to the same entity independently of the context; a symbol arbitrarily denotes a referent. See also icon and index. 

  • A signalling event on a communications channel; a signal that cannot be further divided into meaningful information. 

  • An internal identifier used by a debugger to relate parts of the compiled program to the corresponding names in the source code. 

  • A character or glyph representing an idea, concept or object. 

  • A summary of a dogmatic statement of faith. 

  • The numerical expression which defines a plane's position relative to the assumed axes. 

  • A thing considered the embodiment of a concept or object. 

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