Line segment ranges and pencils which have equal cross ratios are said to be equicross.
Equicross
See also
Cross Ratio, Line Segment Range, PencilExplore with Wolfram|Alpha
References
Durell, C. V. Modern Geometry: The Straight Line and Circle. London: Macmillan, pp. 74-76, 1928.Lachlan, R. §422-428 in An Elementary Treatise on Modern Pure Geometry. London: Macmillian, pp. 269-274, 1893.Referenced on Wolfram|Alpha
EquicrossCite this as:
Weisstein, Eric W. "Equicross." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Equicross.html