psi

Meaning

Noun

1. The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
2. A form of psychic energy.

Symbol

Pounds per square inch (an imperial unit of pressure)

Synonyms

pounds per square inch

ESP

extra-sensory perception

psychic ability

ψ

Pronounced as (IPA)

/psaɪ/

Etymology

From Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).