What does "psi" mean?

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

What is a synonym for "psi"?

Common synonyms include: pounds per square inch, pounds per square inch.

//psaɪ// name, noun, symbol

name, noun, symbol ·Uncommon ·Advanced level

Noun

1
The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek. countable
2
Initialism of pre-sentence investigation. abbreviation, alt-of, initialism
3
the 23rd letter of the Greek alphabet wordnet
4
A form of psychic energy. uncountable
"‘Come, lad,’ he said. ‘We will take tea together and speak of the noumenon, the psi and other more heterogenous phenomena.’"
5
Initialism of protein structure initiative. abbreviation, alt-of, initialism

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6
a unit of pressure wordnet
7
Initialism of pollutant safety/standard index (measurement of the air pollutant such as haze). abbreviation, alt-of, initialism

Symbol

1
Pound per square inch (an imperial unit of pressure)
"Each turbogenerator consisted of a steam turbine, powered by 900 psi of superheated steam, that was coupled by a set of reduction gears to a General Electric marine alternating-current generator operating at 1,800 rpm. Each generator had a capacity of 2,000 kilowatts of three-phase power at 450 volts and 60 hertz. The main 450-volt switchboard was energized by the two turbogenerators. The emergency switchboard, in the emergency generator room, was fed from the main switchboard through an electrical tie."

Proper Noun