  A differential calculus on Cuntz algebra with three generators coming from
the action of rotation group in three dimensions is introduced. The
differential calculus is shown to satisfy Assumptions I-IV of [1] so that
Levi-Civita Connection exists uniquely for any pseudo-Riemannian metric in the
sense of [1]. Scalar curvature is computed for the Levi-Civita connection
corresponding to the canonical bilinear metric.
