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-245 Braille pattern dots-245 The Braille pattern dots-245 ( ) is a 6-dot braille cell with the top right and both middle dots raised, or an 8-dot braille cell with the top right and both upper-middle dots raised. It is represented by the Unicode code point U+281a, and in Braille ASCII with J. In unified international braille, the braille pattern dots-245 is used to represent a voiced palatal affricate, fricative, or approximant, such as /dʑ/, /ʑ/ or /j/, and is otherwise assigned as needed. It is also used for the number 0. Related to Braille pattern dots-245 are Braille patterns 2457,