digamma
Noun
Meaning
A letter (/, /) of the Greek alphabet, which early fell into disuse.
Source: Webster's dictionaryPhrases with the word
Examples
All three poets, for example, employed digamma inconsistently, sometimes allowing it to affect syllable length and meter, sometimes not.
After sound changes eliminated /w/ from spoken Greek, digamma was used only as a numeral.
However, the Greek alphabet also gave rise to other alphabets, and some of these retained letters descended from digamma.
These metrical inconsistencies (along with a knowledge of comparative linguistics) have led scholars to infer the presence of a lost digamma consonant in an old form of that line.
Latin 'F,' despite being pronounced differently, is ultimately descended from digamma and closely resembles it in form.
The digamma function, which is the derivative of this function, is also commonly seen.