Morse code required for the privilege to use the HF bands. Until 2000, proficiency at the 20 wpm level was required to receive the highest level of amateur license (Amateur Extra Class); effective April 15, 2000, the FCC reduced the Extra Class requirement to five wpm. Finally, effective on February 23, 2007, the FCC eliminated the Morse code proficiency requirements from all amateur radio licenses. While voice and data transmissions are limited to specific amateur radio bands under U.S. rules, Morse code is permitted on all amateur bands—LF, MF, HF, VHF, and UHF. In some countries, certain portions of the amateur radio
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