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
Naming conventions of the International Phonetic Alphabet Naming conventions of the International Phonetic Alphabet The International Phonetic Alphabet (IPA) requires specific names for the symbols and diacritics used in the alphabet. It is often desirable to distinguish an IPA symbol from the sound it is intended to represent, since there is not a one-to-one correspondence between symbol and sound in broad transcription. The symbol's names and phonetic descriptions are described in the "Handbook of the International Phonetic Association". The symbols also have nonce names in the Unicode standard. In some cases, the Unicode names and the IPA names do not agree. For example, IPA calls "epsilon", but