Facet
An 
-D Face of an 
-D Polytope. A procedure for generating facets is known as Faceting.
- Schröter's Formula
- Schur Algebra
- Schur Functor
- Schur Matrix
- Schur Multiplier
- Schur Number
- Schur's Inequalities
- Schur's Lemma
- Schur's Problem
- Schur's Representation Lemma
- Schur's Theorem
- Schwarzian Derivative
- Schwarz-Pick Lemma
- Schwarz Reflection Principle
- Schwarz's Inequality
- Schwarz's Triangle Problem
- Schwarz Triangle
- Schwenk's Formula
- Schönflies Symbol
- Schönflies Theorem
- Scientific Notation
- s-Cluster
- Score Sequence
- Screw
- Screw Theorem