Morse code
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Morse code is a communication system that uses signals—traditionally short and long beeps or flashes of light—to represent letters, numbers, and punctuation marks. It was historically important for long-distance communication, especially in telegraphy and maritime radio, before modern technology made it largely obsolete, though it remains in use by some hobbyists and professionals today.
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This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur. Chart of the Morse code 26 letters and 10 numerals
Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. It is named after Samuel Morse, one of several developers of the system. Morse's preliminary proposal for a telegraph code was replaced by an alphabet-based code developed by Alfred Vail, the engineer working with Morse. Vail's version was used for commercial telegraphy in North America. Friedrich Gerke simplified Vail's code to produce the code adopted in Europe, and most of the alphabetic part of the (ITU) "Morse" is copied from Gerke's revision.