After sound changes eliminated /w/ from spoken Greek, digamma was used only as a numeral. However, the Greek alphabet also gave rise to other alphabets, and some of these retained letters descended from digamma. In the Etruscan alphabet, ‘F’ probably represented /w/, as in Greek, and the Etruscans formed the digraph ‘FH’ to represent /f/. (At the time these letters were borrowed, there was no Greek letter that represented /f/: the Greek letter phi ‘Φ’ then represented an aspirated voiceless bilabial plosive /pʰ/, although in Modern Greek it has come to represent /f/. ) When the Romans adopted the alphabet, they used ‘V’ (from Greek upsilon) not only for the vowel /u/, but also for the corresponding semivowel /w/, leaving ‘F’ available for /f/. And so out of the various vav variants in the Mediterranean world, the letter F entered the Roman alphabet attached to a sound which its antecedents in Greek and Etruscan did not have. The Roman alphabet forms the basis of the alphabet used today for English and many other languages.
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