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F (named ef /ɛf/) is the sixth letter in the modern English alphabet and the ISO basic Latin alphabet.
The origin of 'F' is the Semitic letter vâv (or waw) that represented a sound like /v/ or /w/. Graphically it originally probably depicted either a hook or a club. It may have been based on a comparable Egyptian hieroglyph such as that which represented the word mace (transliterated as ḥ(dj)):
The Phoenician form of the letter was adopted into Greek as a vowel, upsilon (which resembled its descendant 'Y' but was also the ancestor of the Roman letters 'U', 'V', and 'W'); and, with another form, as a consonant, digamma, which indicated the pronunciation /w/, as in Phoenician. Latin 'F,' despite being pronounced differently, is ultimately descended from digamma and closely resembles it in form.
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.
The lowercase ' f ' is not related to the visually similar long s, ' ſ ' (or medial s). The use of the long s largely died out by the beginning of the 19th century, mostly to prevent confusion with ' f ' when using a short mid-bar (see more at: S).
Use in writing systems
In the English writing system ⟨f⟩ is used to represent the sound /f/, the voiceless labiodental fricative. It is commonly doubled at the end of words. Exceptionally, it represents the voiced labiodental fricative /v/ in the common word "of".
In the writing systems of other languages, ⟨f⟩ commonly represents /f/, or /v/.
The International Phonetic Alphabet uses ⟨f⟩ to represent the voiceless labiodental fricative.