Theta (UK: / ˈθiːtə /, US: / ˈθeɪtə /) uppercase Θ or ϴ; lowercase θ[note 1] or ϑ; Ancient Greek: θῆτα thē̂ta [tʰɛ̂ːta]; Modern: θήτα thī́ta [ˈθita]) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth 𐤈. In the system of Greek numerals, it has a value of 9.

Copy and paste the theta symbol (θ Θ). Learn about uppercase and lowercase theta symbols, their meanings, and how to type them. Includes comprehensive guide for Greek letters.

Theta (uppercase ϴ, lowercase θ) is the eighth letter of the Greek alphabet. In the Greek numeral system, it represents the number nine. Theta was also used as a symbol of death in Greek and Latin epigraphy. The Phoenician letter Teth (or ṭēt) gave rise to …

Theta (uppercase Θ / lowercase θ), is a letter in the Greek alphabet. It represents the "th" sound (as in "think") in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 9. The Cyrillic letter Ѳ came from theta.

Don't be surprised if you encounter these letters in non-math classes. The Greek letters you are most likely to see for angles (in geometry and trigonometry) are α (alpha), β (beta), γ (gamma), δ (delta), and θ (theta). And of course you'll be using π (pi) all the time.

What is the significance of the Greek letter Theta? Theta, symbolized as “Θ” in uppercase and “θ” in lowercase, holds various meanings across different contexts. It represents the number 9 in ancient Greek numerals, symbolizes angles in geometry and trigonometry, and signifies temperature in physics.

2019年5月30日 · Theta is the eighth letter in the Greek alphabet written as Θ or ϴ in uppercase and θ in lowercase. Theta symbol is a derivation of the letter teth in the Phoenician alphabet. In the Phoenician language, teth was used to describe a wheel.

2025年1月17日 · theta (plural thetas) The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ. (mathematics) The measure of an angle. (aviation, by extension) Pitch angle; the angle between an aircraft 's longitudinal axis and the horizontal plane. (finance) The sensitivity of the value of a derivative with respect to time; the "time decay".

Theta, written in ancient Greek as θῆτα and as θήτα in modern Greek has an uppercase (Θ or ϴ) and lowercase (θ) symbol. Both resemble the number 0 or a circle or oval with a horizontal line in the middle. It is the eighth letter of the Greek alphabet and is known to have been derived from the Phoenician letter Teth.

The Greek letter θ (theta) is used in math as a variable to represent a measured angle. For example, the symbol theta appears in the three main trigonometric functions: sine, cosine, and tangent as the input variable. In plain language, this represents the cosine function which takes in one argument represented by the variable θ.