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Θ

From Wiktionary, the free dictionary

See also: θ, θ', ө, ѳ, and ꆪ

Θ	U+0398, Θ GREEK CAPITAL LETTER THETA

← Η
[U+0397]

Greek and Coptic

Ι →
[U+0399]

Translingual

Symbol

Θ

(set theory) Θ, the ordinal number with the same cardinality as the smallest set larger than the real numbers; the smallest nonzero ordinal number such that there exists no surjection onto it from the real numbers.
(physics) A pentaquark.
(speech pathology) Protruded tongue.

Ancient Greek

Etymology

From Phoenician 𐤈 (ṭ, “ṭēt”).

Letter

Θ • (Th) (uppercase, lowercase θ)

The letter theta (θῆτα), the eighth letter of the ancient Greek alphabet.

Derived terms

(Cyrillic) Ѳ
(Coptic) Ⲑ

See also

(Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
(non-Classical letters) Ϝ (W) ϝ (w), Ͷ ͷ, Ͱ (H) ͱ (h), Ϻ (S) ϻ (s), Ϟ, ϟ, Ϙ (Q) ϙ (q), Ͳ (S) ͳ (s)
(punctuation) · ;
(diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Greek

Letter

Θ • (Th) (uppercase, lowercase θ)

The upper case letter theta (θήτα), the eighth letter of the modern Greek alphabet.

Numeral

Θ • (Th)

The number nine in Greek numerals.

Derived terms

,Θ (,Th, “The number 9000 in Greek numerals”)

Descendants

Ѳ, ѳ

See also

(Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
(non-Classical letters) Ϝ (W) ϝ (w), Ͷ ͷ, Ͱ (H) ͱ (h), Ϻ (S) ϻ (s), Ϟ, ϟ, Ϙ (Q) ϙ (q), Ͳ (S) ͳ (s)
(punctuation) · ;
(diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Wakhi

Pronunciation

IPA^(key): /θ/

Letter

Θ (lower case ϑ)

A letter of the Wakhi alphabet, written in the Latin script.

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