digamma

di·gam·ma  (d-gm)

n.

A letter occurring in certain early forms of Greek and transliterated in English as w.

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[Latin, from Greek : di-, two; see di-¹ + gamma, gamma (because its shape resembles two gammas); see gamma.]

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digamma [daɪˈgæmə]

n

(Linguistics / Letters of the Alphabet (Foreign)) a letter of the Greek alphabet (Ϝ) that became obsolete before the classical period of the language. It represented a semivowel like English W and was used as a numeral in later stages of written Greek, and passed into the Roman alphabet as F

[via Latin from Greek, from di-¹ + gamma; from its shape, which suggests one gamma upon another]