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Theta
From Teflpedia
Θ (lower case θ), called theta (/ˈθi:tə/) is the eighth letter of the Greek alphabet.[1]
In Greek-to-English loans, it’s transliterated as ⟨th⟩, e.g. mathematics, theatre, sympathise, etc.
In IPA a lower case θ represents the voiceless dental fricative.
It’s also used in theta theory, which is part of generative grammar.
It shouldn’t be confused with the barred O letter Ɵ.