Formulas
- Surface area
- Surface plasmon resonance
- Matrix similarity
- SKI combinator calculus
- Schrödinger group
- Schrödinger picture
- Scope (logic)
- Screw theory
- Selection (relational algebra)
- Self-organizing map
- Semicircle law (quantum Hall effect)
- Septic equation
- Skew lines
- Sliding (motion)
- Slip (materials science)