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An officer inspects enlisted sailors in Service Dress Blue (2008) A female U.S. Navy officer in Service Dress Blue uniform (2012) The Service Dress Blue (SDB) uniform consists of a dark navy blue suit coat and trousers (or optional skirt for women) that are nearly black in color, a white shirt, and a black four-in-hand necktie for men or a neck tab for women.
The original name of the letter "Sigma" may have been san, but due to the early history of the Greek epichoric alphabets, "san" came to be identified as a separate letter, Ϻ. [3] Herodotus reported that "san" was the name given by the Dorians to the same letter called "Sigma" by the Ionians .