The Roche lobe is the region of space around a star in a binary system within which orbiting material is gravitationally bound to that star. If either star gets bigger than its Roche lobe—those teardrop-shaped bits in the middle—it starts bleeding material into the other star.
I am sure nobody would’ve ever thought to create an equipotential plot like the one above for the Kasterborous system, then use a heavily stylized version as a crest. Nope. Never.