angle bracket vs square bracket

angle bracket

noun
  • Either of a pair of symbols, ⟨ ⟩, used to enclose text in various technical contexts, and in mathematical formulas to denote an interval, a continuous parameter or an inner product. 

  • Either of a pair of symbols, 〈 〉, used in Chinese, Japanese, and Korean punctuation. 

  • Either of a pair of symbols, 〈 〉, used to enclose the name of the domain in which a concept and a term is used. 

  • Either of the inequality signs < and >, when used as brackets in programming languages and markup languages. 

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 angle bracket and square bracket occurred in a corpus of books? (source: Google Ngram Viewer )