The plus and minus signs (+ and −) are mathematical symbols used to represent the notions of positive and negative as well as the operations of addition and subtraction. Their use has been extended to many other meanings, more or less analogous. Plus and minus are Latin terms meaning "more" and "less", respectively.
Read more about Plus And Minus Signs: History, Plus Sign, Minus Sign, Use in Elementary Education, Use As A Qualifier, Uses in Computing, Other Uses, Character Codes
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—Abraham Lincoln (1809–1865)