Morse code a heliograph, a common flashlight, or even a car horn. Some mine rescues have used pulling on a rope - a short pull for a dot and a long pull for a dash. Morse code is transmitted using just two states (on and off). Historians have called it the first digital code. Morse code may be represented as a binary code, and that is what telegraph operators do when transmitting messages. Working from the above ITU definition and further defining a bit as a dot time, a Morse code sequence may be made from a combination of the following five-bit
Braille pattern dots-25 Braille pattern dots-25 The Braille pattern dots-25 ( ) is a 6-dot braille cell with both middle dots raised, or an 8-dot braille cell with both upper-middle dots raised. It is represented by the Unicode code point U+2812, and in Braille ASCII with the number 3. In unified international braille, the braille pattern dots-25 is used to represent a colon or other punctuation or mathematical operators. Related to Braille pattern dots-25 are Braille patterns 257, 258, and 2578, which are used in 8-dot braille systems, such as Gardner-Salinas and Luxembourgish Braille. In the Japanese kantenji braille, the standard 8-dot Braille