Alpha / ˈælfə / ⓘ ALF-ə[1] (uppercase Α, lowercase α) [a] is the first letter of the Greek alphabet. In the system of Greek numerals, it has a value of one.

The ‘α’ is a letter of the Greek alphabet. In mathematics, physics, and engineering, it is often used to denote an angle, a coefficient of thermal expansion, as an alpha particle, among other uses.

Learn about the Greek letter Alpha (α), its pronunciation, usage examples, and common applications in mathematics, science, and engineering.

Greek alphabet letters & symbols Greek alphabet letters are used as math and science symbols. Greek alphabet list

Nov 21, 2025 · α • (a) (lowercase, uppercase Α) Lower-case alpha (ἄλφα), the first letter of the ancient Greek alphabet. It represented the open front or central unrounded vowel /a/. It is followed by β.

Alpha (uppercase Α; lowercase α) is the first letter of the Greek alphabet. The Greek alphabet is the ancestor of modern languages and is derived from the Phoenician alphabet.

Uses of Alpha in Mathematics In mathematics, α is one of the most commonly used Greek letters: