Bicorn
The bicorn is the name of a collection of Sylvester 
in 1864 and Cayley in 1867 (MacTutor Archive). The bicorn is given by the parametric equations
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The graph is similar to that of the Cocked Hat Curve.
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 147-149, 1972.
MacTutor History of Mathematics Archive. ``Bicorn.''http://www-groups.dcs.st-and.ac.uk/~history/Curves/Bicorn.html.
- Steiner-Lehmus Theorem
- Steiner Points
- Steiner Quadruple System
- Steiner's Ellipse
- Steiner Set
- Steiner's Hypocycloid
- Steiner's Porism
- Steiner's Problem
- Steiner's Segment Problem
- Steiner's Theorem
- Steiner Surface
- Steiner System
- Steiner Triple System
- Steinhaus-Moser Notation
- Steinitz's Theorem
- Steinmetz Solid
- Stella Octangula
- Stella Octangula Number
- Stellated Polyhedron
- Stellated Tetrahedron
- Stellated Truncated Hexahedron
- Stellation
- Stem-and-Leaf Diagram
- Step
- Step Function