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A plus sign after a move, recording that the move attacks the enemy king.
Also known as: Chess check symbol, Chess plus sign, Check mark in chess
In chess notation a plus sign appended to a move means that move gives check — the king is under attack and the opponent must answer it immediately. It records a fact about the position, not a judgement about the move.
Appended to a move in algebraic notation to record that the move gives check. FIDE's Laws specify the notation used in competition play.
Says nothing about whether the move is good. A checking move can be a blunder, and the annotation symbols exist precisely because the notation itself carries no opinion.
A plus sign — two equal strokes crossing at right angles — written immediately after the move it describes.
One plus means check, which the opponent can answer. The hash means checkmate, which ends the game. Reading one as the other reverses the result.
Both belong to FIDE algebraic notation, which records what a move did.