observed Implied vol fitted to a live options market on this symbol.
partial A real options market, too few expiries to trust its shape.
Anchored symbol, tenor outside the fitted range. Held flat, never extended.
inferred No options market. Level from this symbol's own tape times the cohort premium, shape borrowed from the nearest-volatility anchors.
unvalidated Inferred, but this symbol's volatility sits outside the donor range, where leave-one-out testing showed the method fails.
modelled Not crypto. No cohort to borrow a shape from at all.