Signaling nautical flag "A" Alfa 150x180cm This flag can be used to denote the letter "A" or to communicate the following messages: I have a sub on land Keep well away and at low speed Characteristics Letter to Radio: Alpha Single flag meaning: “I have a diver on a dive; keep well away and proceed at low speed.” Meaning coupled with numerical flags: With three numerical flags, it indicates its direction or position. Morse Code: · −  (Dot Dash) Original German Army product Non-fading rayon, cotton and linen fabric Rope with hooks Dimensions: 150x180cm NSN 8345-12-120-7234 Federal Supply Classification FSC 8345 - Flags and Pennants National Item Identification Number NIIN 121207234 CODIFICATION COUNTRY: Germany NSN DESCRIPTION: Flag signal