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-235 Braille pattern dots-235 The Braille pattern dots-235 ( ) is a 6-dot braille cell with dots raised, or an 8-dot braille cell with raised. It is represented by the Unicode code point U+2816, and in Braille ASCII with the number 6. In unified international braille, the braille pattern dots-235 is used to represent an exclamation point, other punctuation, and otherwise assigned as needed. † Abolished in Unified English Braille Related to Braille pattern dots-235 are Braille patterns 2357, 2358, and 23578, which are used in 8-dot braille systems, such as Gardner-Salinas and Luxembourgish Braille. In the Japanese kantenji braille, the