Lozenge
An equilateral Parallelogram whose Acute Angles are 45°. Sometimes, the restriction to 45° is dropped, and it is required only that two opposite angles are acute and the other two obtuse. The termRhombus is commonly used for an arbitrary equilateral parallelogram.
See also Parallelogram, Quadrilateral, Rhombus- Suslin's Theorem
- Suspended Knot
- Suspension
- Suzanne Set
- Suzuki Group
- Swallowtail Catastrophe
- Swastika
- Swastika Curve
- Sweep Signal
- Swinnerton-Dyer Conjecture
- Swinnerton-Dyer Polynomial
- Swirl
- Sylow p-Subgroup
- Sylow Theorems
- Sylvester Cyclotomic Number
- Sylvester Graph
- Sylvester Matrix
- Sylvester's Determinant Identity
- Sylvester's Four-Point Problem
- Sylvester's Inertia Law
- Sylvester's Line Problem
- Sylvester's Sequence
- Sylvester's Signature
- Sylvester's Triangle Problem
- Symbolic Logic