psi

Parapsychological phenomena or abilities considered as a group.

pounds per square inch

The 23rd letter of the Greek alphabet.

A Greek letter, Ψ, ψ. It belongs to the Ionic alphabet, and stands for ps or phs. The character may be a modification of Φ, φ.

Pounds per square inch (an imperial unit of pressure)

The twenty-third letter of Classical and Modern Greek and the twenty-fourth letter of Old and Ancient Greek.

A form of psychic energy.

the 23rd letter of the Greek alphabet

a unit of pressure