SOS

Etymology 1
Chosen because its Morse code sequence was easy to remember and recognize even through interference. Many mnemonics and backronyms were later formed from the sequence.

Symbol

 * 1) emergency, mayday, distress

Usage notes
The code SOS is normally only used in text transmission; for voice communication, is used. The sequence is normally transmitted run together without any letter spacing in between, so it is technically a single unique code rather than a series of three letters.

Etymology 1
From the letters represented by the signal, chosen as a sequence that is easy to recall and transmit (· · · — — — · · ·); it is not, as is commonly believed, an abbreviation for "save our souls", "save our ship", or any other phrase.

Noun

 * 1) The conventional Morse code call made by a ship in distress.

Phrase

 * : a warning to a woman that the underwear she has on can be seen.

Noun

 * 1)  A children's game in which players take turns to place S's and O's on a grid, collecting points by creating an "SOS" sequence.

Usage notes

 * Only used with the past participle, chiefly in historical military records.

Etymology
Borrowed from.

Noun

 * 1)  the state of being sought an emergency rescue
 * 1)  the state of being sought an emergency rescue

Etymology 1
. Ultimately from the fact that its morse code is easy to remember. .

Noun

 * , international telegraphic distress signal

Etymology 2
. Probably in origin, most likely from the distress signal of the same name.

Noun

 * 1) A traditional appetizer consisting of butter, cheese, and herring; a smaller version of the.

Noun

 * 1) a particular collection of systems and processes that produce official statistics about Sweden

Noun

 * , largest hospital in Stockholm, Sweden