 Ultraparallel theorem

The term "Ultraparallel theorem" is not widely recognized in established mathematical literature or common mathematical terminology. However, it is possible that you are referring to a theorem related to non-Euclidean geometries or the properties of parallel lines. In the context of hyperbolic geometry, for example, two lines may be defined as "ultraparallel" if they do not intersect and are not parallel in the sense used in Euclidean geometry.