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# Beta (Β, β) Definition Beta (Β, β) is the second letter of the Greek Alphabet. In the system of Greek Numerals, it has a value of 2. Letters that arose from beta include the Roman letter B and the Cyrillic letters Б and В.

## Usage in Mathematics & Science

Beta is often used to denote a variable in mathematics and physics, where it often has specific meanings for certain applications. In physics a stream of unbound energetic electrons is commonly referred to as beta radiation or beta rays. In regression analysis, Β symbolizes nonstandardized partial slope coefficients, whereas β represents standardized (standard deviation-score form) coefficients; in both cases, the coefficients reflect the change in the criterion Y per one-unit change in the value of the associated predictor X.

β is sometimes used as a placeholder for an ordinal number if α is already used.

In spaceflight, beta angle describes the angle between the orbit plane of a spacecraft or other body and the vector from the sun.

## Greek Alphabet

The letters of the Ancient Greek Alphabet, which are frequently utilized in math and science:

 Greek Alphabet Symbol Letter Symbol Letter Uppercase Lowercase Uppercase Lowercase Α α Alpha Ν ν Nu Β β Beta Ξ ξ Xi Γ γ Gamma Ο ο Omicron Δ δ Delta Π π Pi Ε ε Epsilon Ρ ρ Rho Ζ ζ Zeta Σ σ Sigma Η η Eta Τ τ Tau Θ θ Theta Υ υ Upsilon Ι ι Iota Φ φ Phi Κ κ Kappa Χ χ Chi Λ λ Lambda Ψ ψ Psi Μ μ Mu Ω ω Omega

### Sources

“Beta.” Wikipedia, Wikimedia Foundation, 15 Apr. 2020, en.wikipedia.org/wiki/Beta.

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