Tire spec abbr

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it’s A 14 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: PSI.

Random information on the term “PSI”:
Psi (uppercase Ψ, lowercase ψ; Greek: Ψι Psi) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word “lapse”).
Taken from Wikipedia