Morse code

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several codes used for transmitting messages in which letters of the alphabet and numbers are represented by various sequences of dots and dashes or short and long signals, especially the international Morse code.

from the GNU version of the Collaborative International Dictionary of English.

• (Teleg.) a telegraphic code, in which dots, dashes, and spaces represent letters, numbers, and other elements of text. The original code was invented by Samuel B. Morse. The code now mostly used is the International Morse code, also referred to simply as the Morse code.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun A character code represented by dots and dashes (or short and long pulses), originally used to send messages by telegraph, later by flashes of light or by radio.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a telegraph code in which letters and numbers are represented by strings of dots and dashes (short and long signals)