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-23 Braille pattern dots-23 The Braille pattern dots-23 ( ) is a 6-dot braille cell with the middle and bottom left dots raised, or an 8-dot braille cell with the two middle-left dots raised. It is represented by the Unicode code point U+2806, and in Braille ASCII with the number "2". In unified international braille, the braille pattern dots-23 is used to represent a voiced bilabial consonant, such as /b/ or /ɓ/ when multiple letters correspond to these values, and is otherwise assigned as punctuation or accent mark, as needed. Related to Braille pattern dots-23 are Braille patterns 237, 238, and