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
History of the International Phonetic Alphabet were slightly modified. In particular, was replaced by , with a continuous, slanted stroke. In 2018, another slightly modified chart in different fonts was released, this time also in TeX TIPA Roman developed by Rei Fukui, which was selected as best representing the IPA symbol set by the Association's Alphabet, Charts and Fonts committee, established the previous year. History of the International Phonetic Alphabet The International Phonetic Alphabet was created soon after the International Phonetic Association was established in the late 19th century. It was intended as an international system of phonetic transcription for oral languages, originally for pedagogical purposes.