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-236 Braille pattern dots-236 The Braille pattern dots-236 ( ) is a 6-dot braille cell with the middle left and both bottom dots raised, or an 8-dot braille cell with the upper-middle left and both lower-middle dots raised. It is represented by the Unicode code point U+2826, and in Braille ASCII with the number 8. In unified international braille, the braille pattern dots-236 is used to represent various punctuation, often coupled with Braille pattern dots-356 as an opening mark. Related to Braille pattern dots-236 are Braille patterns 2367, 2368, and 23678, which are used in 8-dot braille systems, such as Gardner-Salinas