Two lines in hyperbolic geometry which diverge from each other in both directions.
Hyperparallel
See also
Antiparallel, Ideal Point, ParallelExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Hyperparallel." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Hyperparallel.html