P

P is the 16th letter of the Latin alphabet. Semitic Pê (mouth) as well as Greek Π or π (Pi) and the Etruscan and Latin letters that developed from the former alphabet all symbolized /p/.

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

Those who speak Arabic usually have difficulty pronouncing this sound; they pronounce like b instead.

P is also:

• In chemistry, P is the symbol for the element phosphorus.
• In complexity theory, P is the set of decision problems solvable in polynomial time on a deterministic Turing machine. See Complexity classes P and NP.
• In physics, p is the symbol for momentum.
• As p, the symbol for a now obsolete unit of force, see kilopond.
• In symbolic logic, p is often used to denote a proposition as well as q and r.
• In some educational systems, P stands for Pass (course completion).