Referee's item (3,4)
(Other definitions for red card that I've seen before include "Football punishment" , "It signals a serious rule infringement" , "Referee's sanction" , "Sending-off signal?" , "sign of dismissal" .)
(Other definitions for yellow card that I've seen before include "With which a referee cautions player" , "Warning leading to temporary dismissal" , "Warning to footballers" , "Footballer's caution" , "Warning to footballer" .)