Theta (disambiguation)

Theta (Θ or θ) is the eighth letter of the Greek alphabet.

Theta may also refer to:

Science and mathematics

 * Θ (set theory), the least ordinal α such that there is no surjection from the reals onto α
 * Theta (gastropod), a genus of sea snails
 * Theta functions, special functions of several complex variables
 * Theta meson, a hypothetical meson in quantum physics
 * Theta representation, a particular representation of the Heisenberg group of quantum mechanics
 * Theta wave, in biology
 * Theta*, a pathfinding algorithm in computer science
 * $$f = \Theta(g)$$, a Bachmann–Landau notation in computational complexity theory
 * The denotation for potential temperature
 * A common symbol for a variable of the measure of an angle
 * SARS-CoV-2 Theta variant, one of the variants of SARS-CoV-2, the virus that causes COVID-19

Business

 * GM Theta platform, an automobile platform of General Motors
 * Theta Networks a telecommunications software company

Music

 * Theta (musician), a Greek musician
 * Theta (Brymo album), 2022

Other uses

 * Theta Nedra Berwick, or simply Theta, a fictional character and the protagonist of Marvel Comics' Predator by Ed Brission
 * Theta (finance), in quantitative finance, a first order derivative of an option pricing formula versus time
 * Theta role, in linguistics
 * Theta, Gauteng, a suburb of Johannesburg, South Africa
 * An IPA symbol for voiceless dental fricative
 * Hyundai Theta engine a four cylinder gasoline engine made by Hyundai.
 * Kappa Alpha Theta, a North American collegiate sorority