| Abbreviation | Definition |
|---|---|
| PEM | Pareto Equilibrium Model |
| PEMDAS | Parentheses Exponents Multiply Divide Add Subtract |
| PEMDAS | Parentheses Exponents Multiply Divide Add Subtract |
| PEMDAS | Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction |
| PEMDAS | Parentheses, Exponents, Multiplication, Division, Addition, Subtraction |
| PEMV | Probabilistic Estimation of Missing Values |
| PEPA | Performance Evaluation Process Algebra |
| PER | Partial Equivalence Relation |
| PEST | Parameter ESTimation model |
| PF | Prime Factorization |
| PFGT | Parallel Fast Gauss Transform |
| Pg | Petagram |
| PG | Picogram |
| PGP | Post Gauda Prime |
| PGSM | Paris Graduate School of Mathematics |
| PHR | Psi Hit Ratio |
| PHT | Pseudo Hadamard Transform |
| PI | Pareto Improved |
| PI | The ratio of the circumference to the diameter of a circle; approximately equal to 3.141592653589793 |
| PID | Principal Ideal Domain |