comma vs square bracket

comma

noun
  • A similar-looking subscript diacritical mark. 

  • A difference in the calculation of nearly identical intervals by different ways. 

  • A brief interval. 

  • In Ancient Greek rhetoric, a short clause, something less than a colon, originally denoted by comma marks. In antiquity it was defined as a combination of words having no more than eight syllables in all. It was later applied to longer phrases, e.g. the Johannine comma. 

  • The punctuation mark ⟨,⟩ used to indicate a set of parts of a sentence or between elements of a list. 

  • Any of various nymphalid butterflies of the genus Polygonia, having a comma-shaped white mark on the underwings, especially Polygonia c-album and Polygonia c-aureum of North Africa, Europe, and Asia. 

  • A delimiting marker between items in a genetic sequence. 

verb
  • To place a comma or commas within text; to follow, precede, or surround a portion of text with commas. 

square bracket

noun
  • Either of a pair of symbols, [[[#Translingual|[]] [[Unsupported titles/Right square bracket#Translingual|]]], used for various purposes, e.g. to enclose text inserted or replaced by an editor, and to indicate various mathematical operations. 

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