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Digamma
Digamma, waw, or wau (uppercase: (unicode:Ϝ), lowercase: (unicode:ϝ), numeral: (unicode:ϛ)) is an archaic letter of the Greek alphabet. It originally stood for the sound but it has principally remained in use as a Greek numeral for 6. Whereas it was originally called ''waw'' or ''wau'', its most common appellation in classical Greek is ''digamma''; as a numeral, it was called ''episēmon'' during the Byzantine era and is now known as ''stigma'' after the value of the Byzantine ligature combining σ-τ as ϛ.
Digamma or wau was part of the original archaic Greek alphabet as initially adopted from Phoenician. Like its model, Phoenician waw, it represented the voiced labial-velar approximant and stood in the 6th position in the alphabet between epsilon and zeta. It is the consonantal doublet of the vowel letter upsilon (), which was also derived from waw but was placed at the end of the Greek alphabet. Digamma or wau is in turn the ancestor of the Latin letter F. As an alphabetic letter, it is attested in archaic and dialectal ancient Greek inscriptions until the classical period.
The shape of the letter went through a development from x16px through x16px, x16px, x16px, x16px to x16px or x16px, which at that point was conflated with the σ-τ ligature x16px. In modern print, a distinction is made between the letter in its original alphabetic role as a consonant sign, which is rendered as "Ϝ" or its modern lowercase variant "ϝ", and the numeric symbol, which is represented by "ϛ". In modern Greek, this is often replaced by the digraph .
==Greek w==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Digamma」の詳細全文を読む
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