An articulated head has a flapping hinge, A feathering hinge, and a hinge that allows lead and lag.
A semi-articulated head (eg: the gazelle) has a flapping hinge, a feathering hinge but lead and lag is taken up by a psuedo drag plane damper.
A semi rigid head (eg: the lynx) has a solid titanium head the extension arms of which can absorb lead, lag and flap but it still retains a feathering hinge for pitch.
A fully rigid head will have no hinges whatsover and all movement is absorbed by rigid extension arms to the head.
As an aside - there is no such thing a coning hinge as the only thing that cones is the blade which would do so with or without a flapping hinge as Mr Cierva discovered in the 30s (or didn't as the case may be)
IMHO of course
