Morse code in Cayo Largo del Sur, Cuba is coded as "UCL", and UCL in Morse code is transmitted on its radio frequency. In some countries, during periods of maintenance, the facility may radiate a T-E-S-T code () or the code may be removed which tells pilots and navigators that the station is unreliable. In Canada, the identification is removed entirely to signify the navigation aid is not to be used. In the aviation service, Morse is typically sent at a very slow speed of about 5 words per minute. In the U.S., pilots do not actually have to know Morse to
Braille pattern dots-12 Braille pattern dots-12 The Braille pattern dots-12 ( ) is a 6-dot or 8-dot braille cell with the top two left dots raised. It is represented by the Unicode code point U+2803, and in Braille ASCII with "B". In unified international braille, the braille pattern dots-12 is used to represent a voiced bilabial plosive, ie /b/, and is otherwise assigned as needed. It is also used for the number 2. Related to Braille pattern dots-12 are Braille patterns 127, 128, and 1278, which are used in 8-dot braille systems, such as Gardner-Salinas and Luxembourgish Braille. In the Japanese kantenji braille,