Nautical signaling flag "X" Xray 150x180cm This flag may be used to denote the letter "X" or to communicate the following messages: “Stop what you are doing and pay attention to my signals.” Individual recall Characteristics Letter: X Radio: Xray Single flag meaning: Negative Morse code: − · · −  (Dash Dot Dot Dash) Original German Army product Non-fading rayon, cotton and linen fabric Rope with hooks Dimensions: 150x180cm NSN 8345-12-120-7402 Federal Supply Classification FSC 8345 - Flags and Pennants National Item Identification Number NIIN 121207402 CODIFICATION COUNTRY: Germany NSN DESCRIPTION: Flag signal