angle bracket vs diamond 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. 

diamond bracket

noun
  • Synonym of angle bracket 

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