History of the Greek alphabet retained the sound. A symbol based on the left-hand half ( ├ ) of the letter Η was therefore sometimes used to indicate the presence of where necessary, and its absence was indicated by a symbol based on the right half. During the classical period, ΕΙ came to be pronounced and ΟΥ came to be pronounced , Υ having meanwhile moved to . By about 200 BC, a system of diacritical marks was invented, representing the tone accents in use in Ancient Greek. This also helped to indicate the length of the vowels Α, Ι, and Υ in certain cases
Spelling alphabet names used in lieu of alphabet letters for the purpose of spelling out words. It is used by the Greek armed and emergency services. Malay and related languages (Indonesian etc.) represent letter "L" with "London", since the word "lima" also means "five" in these languages. The Russian spelling alphabet is a spelling alphabet for the Russian version of the Cyrillic alphabet. In Spanish the word "ñoño" (, 'dull') is used for ñ. The PGP word list, the Bubble Babble wordlist used by ssh-keygen, and the S/KEY dictionary, are spelling alphabets for public key fingerprints (or other binary data) – a