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Definition 2024

Θ

Θ

Θ	U+0398, Θ GREEK CAPITAL LETTER THETA

← Η
[U+0397]

Greek and Coptic

Ι →
[U+0399]

See also: θ, θ', ө, ѳ, and ꆪ

Translingual

Symbol

Θ

(set theory) Θ, a certain ordinal number.
(physics) The pentaquark.

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 alphabet: 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

θ

θ

θ	U+03B8, θ GREEK SMALL LETTER THETA

← η
[U+03B7]

Greek and Coptic

ι →
[U+03B9]

See also: Θ, θ', ө, ѳ, and ꆪ

Translingual

Symbol

θ

(geometry) A plane angle.
(IPA) voiceless dental fricative

Usage notes

Not to be confused with ϐ ‎(ϐ) (the curled beta).

See also

θ on Wikipedia.Wikipedia

Greek

Letter

θ • ‎(th) ‎(lowercase, uppercase Θ)

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

Numeral

θ'

The number nine in Greek numerals.

,θ

The number 9000 in Greek numerals.

See also

Greek alphabet: 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