Trifolium
Lawrence (1972) defines a trifolium as a Folium with 
. However, the term ``the'' trifolium issometimes applied to the Folium with 
, which is then the 3-petalled Rose with Cartesian equation
and polar equation
The trifolium with
is the Radial Curve of the Deltoid.See also Bifolium, Folium, Quadrifolium
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 152-153, 1972. MacTutor History of Mathematics Archive. ``Trifolium.''http://www-groups.dcs.st-and.ac.uk/~history/Curves/Trifolium.html.
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