SOS
[[File:thesos.jpg|thumb|right|Drawing of RMS Titanics captain and radio operator, titled "The S.O.S"]]SOS (· · · — — — · · ·) is a Morse code. It is used as distress code, to signal danger. It was introduced by the German government in radio regulations on April 1, 1905. It became the worldwide standard when it was included in the second International Radiotelegraphic Convention, which was signed on November 3, 1906. The convention became effective on July 1, 1908.