An ancient Greek letter (Ϝ), sounded like our w. Thus oinos with the digamma was sounded woinos; whence the Latin vinum, our wine. Gamma, or g, was shaped thus Γ, hence digamma = double g.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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