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
Esperanto orthography diacritic letters. An Esperanto braille magazine, "Aŭroro," has been published since 1920. In Morse code, a dot is added to C and J to derive Ĉ and Ĵ, a dash–dot is added to G and S to derive Ĝ and Ŝ, a dash is added to U to derive Ǔ, and the four dots of H are changed to four dashes for Ĥ. There is a proposed manual alphabet as part of the "Signuno" project. Signuno itself, as signed Esperanto rather than a language in its own right, is a manual logographic Esperanto orthography. The Signuno alphabet derives from international