A signal system devised (1838) by Samuel Morse
for use in the wire telegraph, now used in radiotelegraphy and elsewhere.
Letters, numbers, and punctuation are represented by combination of dots
(brief taps of the transmitting key) and dashes (three times the length
of dots). The codes for letters of the alphabet, or numbers, vary in length
froma single dot or dash to six dots or dashes or a combination thereof.