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[ ef ] (noun.) before 12th century. 40px|left|Anglo-Saxon Futhorc letter ᚠ, which was replaced by Latin ‘f’ Old English lower case letter f, from 7th century replacement by Latin lower case f of the Anglo-Saxon Futhorc letter ᚠ (f, “fe”). f is most closely related to p, k, v, and b; as in English five from Greek πέντε (pente); English wolf, from Latin lupus, and Greek lykos; English fox, vixen; fragile, break; fruit, brook; English verb bear, from Latin ferre.