Google added the extra "E" for Experience in December 2022, emphasizing first-hand knowledge alongside expertise. The framework guides human quality raters, not a single algorithm, so there is no E-E-A-T score to optimize directly.
What it points at is real. Demonstrated experience, a clear author and brand entity, and trust signals corroborated off your own site are the same things that help AI engines decide who is credible enough to quote.