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1. (chess notation) Double check.
2. (chess notation, dated) Checkmate.
3. (programming) Increment by 1 (in certain programming languages such as C and Java).
4. (Internet slang, by extension) Indicating agreement with a previously posted comment.

• (checkmate): #
• (increment): ⧺

• (antonym(s) of “increment by 1”): --

• +

• IPA^(key): /plʌsˈplʌs/

• Audio (US)

  (file)

• Rhymes: -ʌs

++

1. (computing) Indicates a product with additional features or functionality.

   C++

   Notepad++