thumb|500px|Bifolium with A bifolium is a quartic plane curve with equation in Cartesian coordinates:
thumb|500px|Bifolium with A bifolium is a quartic plane curve with equation in Cartesian coordinates: (x^2 + y^2)^2 = ax^2y.
== Construction and equations == thumb|Construction of the bifolium|right|upright=2.0 Given a circle C through a point O, and line L tangent to the circle at point O: for each point Q on C, define the point P such that PQ is parallel to the tangent line L, and PQ = OQ. The collection of points P forms the bifolium.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).