Braille pattern dots-15 Braille pattern dots-15 The Braille pattern dots-15 ( ) is a 6-dot braille cell with the top left and middle right dots raised, or an 8-dot braille cell with the top left and right upper-middle dots raised. It is represented by the Unicode code point U+2811, and in Braille ASCII with E. In unified international braille, the braille pattern dots-15 is used to represent unrounded, near-mid, front vowels, such as /e/ or /ɛ/. It is also used for the number 5. Related to Braille pattern dots-15 are Braille patterns 157, 158, and 1578, which are used in 8-dot braille systems,
Morse code identify the transmitter because the dot/dash sequence is written out next to the transmitter's symbol on aeronautical charts. Some modern navigation receivers automatically translate the code into displayed letters. International Morse code today is most popular among amateur radio operators, in the mode commonly referred to as "continuous wave" or "CW". (This name was chosen to distinguish it from the damped wave emissions from spark transmitters, not because the transmission is continuous.) Other keying methods are available in radio telegraphy, such as frequency shift keying. The original amateur radio operators used Morse code exclusively since voice-capable radio transmitters did not