What does double-check mean in four-player chess on chess.com

The rule says: Delivering a double-check is worth +5, and triple-checks are worth +15 Is a double check when I am checking two players at one move checking one player with a normal double check

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WE Games Four Player Chess Set, Chess Board for Team Chess, Combination Chess Game for Up to 4 Players, Unique Chess Sets for Adults and Kids, Roll Up Vinyl Chess Mat

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CHESS BOARD SET: A twist on the classic game of chess for 2-4 players. This chess set is great for more advanced seasoned players who are up for a

WE Games Four Player Chess Set, Chess Board for Team Chess, Combination Chess Game for Up to 4 Players, Unique Chess Sets for Adults and Kids, Roll Up