From Wikipedia, the free encyclopedia - View original article
|ISO basic Latin alphabet|
In Latin, a stemless variant shape of the upsilon was borrowed in early times as V—either directly from the Western Greek alphabet or from the Etruscan alphabet as an intermediary—to represent the same /u/ sound, as well as the consonantal /w/. Thus, 'num' — originally spelled 'NVM' — was pronounced /num/ and 'via' was pronounced [ˈwia]. From the 1st century AD on, depending on Vulgar Latin dialect, consonantal /w/ developed into /β/ (kept in Spanish), then later to /v/.
In Roman numerals, the letter 'V' is used to represent the number 5. It was used because it resembled the convention of counting by notches carved in wood, with every fifth notch double-cut to form a 'V'.
During the Late Middle Ages, two forms of 'v' developed, which were both used for its ancestor /u/ and modern /v/. The pointed form 'v' was written at the beginning of a word, while a rounded form 'u' was used in the middle or end, regardless of sound. So whereas 'valor' and 'excuse' appeared as in modern printing, 'have' and 'upon' were printed as 'haue' and 'vpon'. The first distinction between the letters 'u' and 'v' is recorded in a Gothic alphabet from 1386, where 'v' preceded 'u'. By the mid-16th century, the 'v' form was used to represent the consonant and 'u' the vowel sound, giving us the modern letter 'u'. Capital 'U' was not accepted as a distinct letter until many years later. 
Like J, K, Q, X, and Z, V is not used very frequently in English. It is the 6th least common letter in the English language, with a frequency of about 1.03% in words. It appears frequently in the Spanish (where its pronunciation is the same as B) and French languages.
In English, V is unusual in that it has not traditionally been doubled to indicate a short vowel, the way for example P is doubled to indicate the difference between 'super' and 'supper'. However, that is changing with newly coined words, such as 'divvy up' and 'skivvies'.
In Japanese, V is often called "bui" (ブイ). This name is an approximation of the English name which substitutes the voiced bilabial plosive for the voiced labiodental fricative (which does not exist in native Japanese phonology) and differentiates it from "bī" (ビー), the Japanese name of the letter B. The sound can be written with the relatively recently developed katakana character 「ヴ」 (vu) va, vi, vu, ve, vo (ヴァ, ヴィ, ヴ, ヴェ, ヴォ), though in practice the pronunciation is usually not the strictly labiodental fricative found in English. Moreover, some words are more often spelled with the b equivalent character instead of vu due to the long-time use of the word without it (e.g. "violin" is more often found as baiorin (バイオリン) than as vaiorin (ヴァイオリン) due partly to inertia, and to some extent due to the more native Japanese sound).
In most languages which use a Latin alphabet, ⟨v⟩ has a [v]-like sound (voiced labiodental fricative). In most dialects of Spanish, it is pronounced the same as ⟨b⟩, [b] or [β̞]. In German and Dutch it can be either [v] or [f].
In Chinese pinyin, ⟨v⟩ is not used, as there is no sound [v] in Standard Mandarin; but the letter ⟨v⟩ is used by most input methods to enter letter ⟨ü⟩, which most keyboards lack. Romanised Chinese is a popular method to enter Chinese text phonetically.
In Irish, the letter ⟨v⟩ is mostly used in loanwords, such as veidhlín from English violin. However the sound [v] appears naturally in Irish when /b/ is lenited or "softened", represented in the orthography by ⟨bh⟩, so that bhí is pronounced [vʲiː], an bhean (the woman) is pronounced [ən̪ˠ ˈvʲan̪ˠ], etc.
|Unicode name||LATIN CAPITAL LETTER V||LATIN SMALL LETTER V|
|Numeric character reference||V||V||v||v|
Letter V with diacritics