digamma

noun

di·​gam·​ma

dīˈgamə,

ˈdīˌg-

1

: a letter of the original Greek alphabet representing a sound approximately that of English w which early fell into disuse except in writing the western dialects and in numerical notation where it represented the number 6

called also vau

—symbol F, ϝ

2

: the sound represented by the letter ϝ

Word History

Etymology

Latin, from Greek, from di- + gamma; from its resemblance to two capital gammas placed on top of each other

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