Plus Sign
  加號
  Plus a.
  1. Math. More, required to be added; positive, as distinguished from negative; -- opposed to minus.
  2. Hence, in a literary sense, additional; real; actual.
     Success goes invariably with a certain plus or positive power.   --Emerson.
  Plus sign Math., the sign (+) which denotes addition, or a positive quantity.
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  plus sign
       n : a sign indicating the operation of addition