di·​gam·​ma | \ dīˈgamə, ˈdīˌg-\

Definition of digamma

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

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History and Etymology for digamma

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

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to mark by some ceremony or observation

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