The purpose of the parentheses is to clarify the meaning of the term being listed. Parentheses always used in pairs allow a writer to provide additional information. Punctuation Anchor Charts Writing Lessons Writing Instruction Teaching Writing In maths I would call it brackets. . I think you should stick with between high CC and CCS and low CS and SCS yield rotation groups where youre using high and low to describe yield instead of trying to form new hyphenated compound words. Parentheses also signify a break in thought but they mark an addition of information rather than an interruption like dashes do. As a writer I find parentheses most useful for draftsediting. While they look similar to brackets they are rounded. Describe the purpose and meaning of parentheses in a numerical expression. If it is the sentence must be recast. Also like dashes parentheses should be used sparingly. The words that make it ...