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Beta (uppercase ?, lowercase ß) is the second letter of the Greek alphabet. In the system of Greek numerals it has a value of 2. It was derived from the Phoenician letter Beth. Letters that arose from Beta include the Roman B and the Cyrillic letters Be and Ve.
In Modern Greek, it represents a voiced labiodental fricative /v/, but in Ancient Greek, it represented a /b/.
Beta should not be confused with the German ligature eszett (ß), which closely resembles the lower case letter beta but is otherwise unrelated.
The Modern Greek name of the letter is ['vi?ta]. The American pronunciation is ['be???] whereas the British pronunciation is ['bi?t?]. See: American and British English pronunciation differences, IPA