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-3456 Braille pattern dots-3456 The Braille pattern dots-3456 ( ) is a 6-dot braille cell with the top right, middle right, and both bottom dots raised, or an 8-dot braille cell with the top right, upper-middle right, and both lower-middle dots raised. It is represented by the Unicode code point U+283c, and in Braille ASCII with a number sign: #. In unified international braille, the braille pattern dots-3456 is used as a number indicator. † Abolished in Unified English Braille Related to Braille pattern dots-3456 are Braille patterns 34567, 34568, and 345678, which are used in 8-dot braille systems, such as