minus sign
From Longman Dictionary of Contemporary EnglishRelated topics: Mathsminus signˈminus ˌsign (also minus) noun [countable] a sign (−) showing that a number is less than zero, or that the second of two numbers is to be subtracted from the first → plus signExamples from the Corpusminus sign• Instead, work backwards from the end of the field, using a minus sign.