Plus and minus signs - Wikipedia
https://en.wikipedia.org/wiki/Plus_and_minus_signs
WEBThe plus sign ( +) and the minus sign ( −) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] . Their use has been extended to many other meanings, more or less analogous.
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