Invariant Quadrea of Orthocenter Triangles from Four Null Points in Universal Hyperbolic Geometry

We consider four distinct null points in the projective plane of Universal Hyperbolic Geometry over a field of characteristic not two. For each triple of points, the associated triply nil triangle admits a well-defined orthocenter via projective polarity. We prove that the quadrea of the projective triangle formed by any three of these four orthocenters is invariant under variation of the cross-ratio parameter, taking the universal value 16/27 . The result is established algebraically and verified by symbolic computation. This invariant extends known absolute constants in Universal Hyperbolic Geometry arising from null configurations, such as those appearing in the 48/64 theorem.