Θ

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

1. (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.
2. (physics) The pentaquark.
3. (speech pathology) protruded tongue

---

Greek

Letter

Θ • (Th) (uppercase, lowercase θ)

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

Numeral

Θ • (Th)

1. 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 (A a), Β β (B b), Γ γ (G g), Δ δ (D d), Ε ε (E e), Ζ ζ (Z z), Η η (Ē ē), Θ θ (Th th), Ι ι (I i), Κ κ (K k), Λ λ (L l), Μ μ (M m), Ν ν (N n), Ξ ξ (X x), Ο ο (O o), Π π (P p), Ρ ρ (R r), Σ σ ς (S s s), Τ τ (T t), Υ υ (U u), Φ φ (Ph ph), Χ χ (Kh kh), Ψ ψ (Ps ps), Ω ω (Ō ō)
• (punctuation) · ;
• (diacritics) ᾿ ῾ ´ ` ῀ ¨ ¯ ˘