SOS

SOS is the international Morse code distress signal (· · · – – – · · ·). This distress signal was first adopted by the German government in radio regulations effective April 1, 1905, and became the worldwide standard under the second International Radiotelegraphic Convention, which was signed on November 3, 1906, and became effective on July 1, 1908. SOS remained the maritime radio distress signal until 1999, when it was replaced by the Global Maritime Distress and Safety System. SOS is still recognized as a visual distress signal.

The SOS distress signal is a continuous sequence of three dits, three dahs, and three dits, all run together without letter spacing. In International Morse Code, three dits form the letter S, and three dahs make the letter O, so "SOS" became an easy way to remember the order of the dits and dahs. In modern terminology, SOS is a Morse "procedural signal" or "prosign", and the formal way to write it is with a bar above the letters: SOS.

In popular usage, SOS became associated with such phrases as "Save Our Ship" or "Save Our Souls" or "Send Out Succour". SOS is only one of several ways that the combination could have been written; VTB, for example, would produce exactly the same sound, but SOS was chosen to describe this combination. SOS is the only nine-element signal in Morse code, making it more easily recognizable, as no other symbol uses more than eight elements.

Alias

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S.O.S. (Lost)

"S.O.S." is the 19th episode of the second season of Lost and the 44th episode overall. The episode was directed by Eric Laneuville, and written by Steven Maeda and Leonard Dick. It first aired on April 12, 2006, on ABC. The characters of Rose Henderson (L. Scott Caldwell) and Bernard Nadler (Sam Anderson) are featured in the episode's flashbacks.

Plot

Flashbacks

Bernard and Rose are seen meeting for the first time when he helps get her car unstuck from the snow. Rose, initially reluctant to accept his help, ultimately manages to free the car with his support. In return for his assistance, and perhaps a result of an initial attraction, she offers to buy him a cup of coffee.

Bernard and Rose are lunching with a view of Niagara Falls, five months after their first meeting. At this point, Bernard proposes to Rose, citing that they "fell into this rhythm". Rose, without giving an answer, reveals she is terminally ill with cancer, and has a year left to live, perhaps slightly longer. Bernard nevertheless reaffirms his proposal, to which Rose responds with an affirmative.

OS

OS, O.S., Os, O's, or os may refer to:

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SO

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