Sgn
Also called Signum. It can be defined as
 | (1) |
 | (2) |
is the Heaviside Step Function. For 
, this can be written | (3) |
- Pseudogroup
- Pseudolemniscate Case
- Pseudoperfect Number
- Pseudoprime
- Pseudorandom Number
- Pseudorhombicuboctahedron
- Pseudoscalar
- Pseudosmarandache Function
- Pseudosphere
- Pseudosquare
- Pseudotensor
- Pseudovector
- Psi Function
- p-Signature
- PSLQ Algorithm
- PSOS Algorithm
- P-Symbol
- Ptolemy Inequality
- Ptolemy's Theorem
- Public-Key Cryptography
- Puiseaux's Theorem
- Pullback Map
- Pulse Function
- Purser's Theorem
- Pursuit Curve