Bifolium
A Folium with 
. The bifolium is the Pedal Curve of the Deltoid, where the Pedal Point is theMidpoint of one of the three curved sides. The Cartesian equation is
and the Polar equation is
See also Folium, Quadrifolium, Trifolium
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 152-153, 1972. MacTutor History of Mathematics Archive. ``Double Folium.''http://www-groups.dcs.st-and.ac.uk/~history/Curves/Double.html.
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