Letter O

O has been written the same way since early Semitic times, but since there were no vowels in the written language, this form signified a guttural "C" sound, from the word cayin (eye). The Greeks assigned it the "O" sound. (Rose Folsom)

V

V had been, in early roman Times, both vowel and consonant. Its vowel value was eventually supplanted by 'U' and 'W.' As a Roman numeral it stands for 5, variously explained as half of 'X' (10) or five fingers of the hand held in a 'V' shape. (Rose Folsum)

'F'

F from early Greek times until about 200BC this sign looked something like a backward "F." and had the wound of a modern "W." The Latins gave it the form and phonetic value that we use today. (Rose Folsum)