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-1 Braille pattern dots-1 The Braille pattern dots-1 ( ) is a 6-dot or 8-dot braille cell with the top left dot raised. It is represented by the Unicode code point U+2801, and in Braille ASCII with "A". In unified international braille, the braille pattern dots-1 is used to represent open, unrounded vowel sound, like /æ/ or /ɑ/, such as the Latin letter A, Greek alpha, Cyrillic А, Hebrew/Arabic aleph, etc. It is also used to signify the number 1. Related to Braille pattern dots-1 are Braille patterns 17, 18, and 178, which are used in 8-dot braille systems, such as