Morse code

communication code with signals representing letters, punctuation marks and numbers

SOS is a Morse code distress signal (), used internationally, originally established for maritime use. In formal notation SOS is written with an overscore line (), to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence of three dots / three dashes / three dots, with no spaces between the letters. In International Morse Code three dots form the letter "S" and three dashes make the letter "O", so "S O S" became a common way to remember the order of the dots and dashes. IWB, VZE, 3B, and V7 form equivalent sequences, but t

radiotelegraphy message code

American inventor (1807–1859)

CQD (transmitted in Morse code as ) is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in distress or in any way requiring assistance shall be 'C Q D.

electrical switch used to transmit text messages in Morse code

visual signaling device for optical communication

German journalist (1801–1888)

Japanese telegraphic code

Morse code operating signal of the US Army

four-digit decimal character encoding for electrically telegraphing messages written with Chinese characters

maritime radio frequency at 500 kHz

Wikimedia list article

operating signal for "request to communicate"

2010 single by Natalia Gutierrez and Angelo