Bra
A (Covariant) 1-Vector denoted 
. The bra is Dual to the Contravariant Ket, denoted 
. Taken together,the bra and Ket form an Angle Bracket (bra+ket = bracket). The bra is commonly encountered inquantum mechanics. 
- Schiffler Point
- Schinzel Circle
- Schinzel's Hypothesis
- Schinzel's Theorem
- Schisma
- Schlegel Graph
- Schläfli Double Six
- Schläfli Function
- Schläfli Integral
- Schläfli Polynomial
- Schläfli's Formula
- Schläfli's Modular Form
- Schläfli Symbol
- Schlömilch's Function
- Schlömilch's Series
- Schmitt-Conway Biprism
- Schnirelmann Constant
- Schnirelmann Density
- Schnirelmann's Theorem
- Schoenemann's Theorem
- Scholz Conjecture
- Schoolgirl Problem
- Schoute Coaxal System
- Schoute's Theorem
- Schrage's Algorithm