morsecode

Morse code is a character encoding scheme used in telecommunication that encodes letters, numerals, punctuation as sequences of short signals (dots) and long signals (dashes). It was developed in the 1830s and 1840s for the electric telegraph by Samuel Morse with Alfred Vail.

The system assigns most common letters short sequences; the length and structure defined by timing rules: dot duration, dash three units; intra-character gap one unit; letter gap three units; word gap seven units. It includes numbers and punctuation; there are also prosigns.

Transmission methods: originally electrical telegraph, later radio telegraphy using continuous waves, as sound or light signals; in practice, morse is transmitted as audible tones on receivers as dits and dahs, or as light flashes. The prototypical mode is CW, but it has been used in radiotelegraphy.

Historical usage and modern status: once essential for long-distance communication; now largely replaced by voice and digital modes, but remains in use in amateur radio, maritime and aviation distress signaling, and emergency preparedness; taught for historical and hobbyist reasons.

Variants and legacy: the internationally standardized International Morse Code encodes the 26 Latin letters, ten digits, and punctuation; earlier American Morse is mostly obsolete.