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In page BBC World Service:

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In addition to these tunes, the BBC World Service also uses several interval signals. The English service uses a recording of Bow Bells, made in 1926 and used a symbol of hope during the Second World War, only replaced for a brief time during the 1970s with the tune to the nursery rhyme "Oranges and Lemons". The morse code of the letter "V" has also been used as a signal and was introduced in January 1941 and had several variations including timpani, the first four notes of Beethoven's Fifth Symphony (which coincide with the letter "V"), and electronic tones which until recently remained in use for some Western European services. In other languages, the interval signal is three notes, pitched B–B-C. However, these symbols have been used less frequently.[citation needed]