- spatial structure
- spcetral radius
- special assignment for a propositional formula
- special class
- special class of modules
- special conjunctive normal form of a propositional formula
- special disjunctive normal form of a propositional formula
- special divisor
- special expression of polar coordinates equation of a curve
- special factor
- special function
- special functional equations
- specialization order
- special Jordan algebra
- special K1-group
- special linear group
- special linear group
- special model
- special orthogonal group
- special perturbation
- special p-group
- special plot software
- special point of locus
- special radical
- special semimartingale