The "+" in Chess is an annotation symbol that refers to the current chess position, "+' refers to a check, where an opposing piece threatens to take the king on the next move, forcing the opponent to move. Alternatively the "+" symbol can be used in referring to the strategic balance of the game position. "+/=" would indicate that White has a slight advantage, while "=/+"  would indicate that Black has a slight advantage. The symbol "+/-" would indicate that white has a clear upper hand advantage, while "-/+" would incur that Black has a clear advantage.  Alternatively, the "++" symbol would mean that a double check had occurred on a king piece, a double check is when a move reveals two pieces attack the king piece.
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