What does E stand for?

Extra (as in extra fine)

This definition appears very rarely

Other Resources:

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Everyone (ESRB) Exa- (10^18, SI Prefix) Excellence (Navy award given to ships or units for top performance) Exchequer (UK) Existing Expectation (mathematics; probability theory) Explorer (Microsoft) Exponentiation Exposure Level Expulsion		Failing Grade (used instead of or in addition to F) Federal Reserve Bank of Richmond, Virginia (designates original point of circulation of a dollar bill) Glutamate (amino acid) Have Directed Traffic (Alabama Public Safety Radio Code) London East (postcode, United Kingdom) New Brunswick (Canada Post designation) Special Delivery (Scott Catalogue prefix; philately) Special Electronic Installation (US Military aerospace mission designation) Tocopherol Acetate (vitamin) Total probable error