W

The earliest form of the letter W was a doubled V used in the 7th century by the earliest writers of Old English; it is from this digraph that the modern name "double U" comes. This digraph was not extensively used, as its sound was usually represented instead by the runic wynn (Ƿ), but W gained popularity after the Norman Conquest, and by 1300 it had taken wynn's place in common use. Other forms of the letter were a pair of Vs whose branches cross in the middle. An obsolete, cursive form found in the nineteenth century in both English and German was in the form of an "n" whose rightmost branch curved around as in a cursive "v" (compare the shape of ƕ).

The ancient Phoenician letter shin had a W shape; the sounds and histories of the two letters, however, are entirely unrelated—shin represented /ʃ/ or /s/, and developed into the Latin alphabet S.

In Europe, there are only a few languages that use W in native words and all are located in a central-western European zone between Cornwall and Poland: English, German, Low German, Polish, Dutch, Frisian, Welsh, Cornish, Breton and Kashubian. English uses W to represent /w/, German and Polish use it for the voiced labiodental fricative /v/ (with Polish using Ł for /w/), and Dutch uses it for /w/ or /ʋ/. Unlike its use in other languages, the letter is used in Welsh to represent the vowel /u/ as well as the related approximant consonant /w/. English also contains a number of words beginning with a W that is silent in most dialects before a (pronounced) R, remaining from usage in Anglo-Saxon in which the W was pronounced: wreak, wrap, wreck, wrench, wroth, wrinkle, etc. (Certain dialects of Scottish English still distinguish this digraph.)

In the Finnish alphabet, "W" is seen as a variant of "V" and not a separate letter. It is however recognised and maintained in the spelling of some old names, reflecting an earlier German spelling standard, and in some modern loan words. In all cases it is pronounced /v/. In the alphabets of most modern Romance languages (excepting far northern French and Walloon), W is little used, it can be found mostly in foreign names and words recently borrowed (le week-end, il watt, el kiwi). When a spelling for /w/ in a native word is needed, a spelling from the native alphabet, such as V, U, or OU, can be used instead. The same was true in the Danish alphabet and Swedish until 1980 and 2006, respectively, when the letter was officially acknowledged as an individual letter.

The Japanese language uses "W", pronounced /daburu/, as an ideogram meaning "double".

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