  A Virasoro central charge can be associated with each Nichols algebra with
diagonal braiding in a way that is invariant under the Weyl groupoid action.
The central charge takes very suggestive values for some items in
Heckenberger's list of rank-2 Nichols algebras. In particular, this might be
viewed as an indication of the existence of reasonable logarithmic extensions
of W_3==WA_2, WB_2, and WG_2 models of conformal field theory. In the W_3 case,
the construction of an octuplet extended algebra---a counterpart of the triplet
(1,p) algebra---is outlined.
