Greek letters are
used in mathematics, science, engineering, and other areas where mathematical notation is used as
symbols for constants, special functions, and also conventionally for variables representing
certain quantities.
A α (alpha)
Alpha represents the following:
§ the first angle in a triangle, opposite the
side A
§ one root of a quadratic
equation,
where β represents the other
§ the statistical
significance of a result
§ the false
positive rate in statistics
§ the fine
structure constant in physics
§ right ascension in astrometry
§ an alpha particle (He2+)
Β β (beta)
Beta (β) represents the
following:
§ the second angle in
a triangle, opposite the
side B
§ one root of a quadratic
equation,
where α represents the other
§ the false
negative rate in statistics
§ a beta particle (e-)
§
ecliptic latitude in astrometry
§ sound intensity
Γ γ (gamma)
Gamma
(γ) represents the following:
§ the lower incomplete gamma function
§ the third angle in a triangle, opposite the side C
§ the heat capacity ratio in thermodynamics
Δ δ (delta)
Delta (δ) represents the
following:
§ a variation in the calculus of variations
§ the Dirac delta function
§ noncentrality
measure in statistics
§ the Skorokhod integral in Malliavin calculus, a subfield of stochastic
analysis
§ the Kronecker
delta function
Ε ε (epsilon)
Epsilon (ε) represents the following:
§ a random error in regression analysis
§ in set theory, the limit ordinal of the sequence
§ expected value in probability theory and statistics
§ elasticity in economics
Ζ ζ (zeta)
Zeta (ζ) represents the following:
§ the Riemann zeta function and other zeta
functions in mathematics
§ the coefficient of viscous friction in polymer dynamics
§ the damping ratio
§ relative vertical vorticity in fluid dynamics
Η η (eta)
Eta (η) represents the following:
§ the partial regression coefficient in statistics
§ elasticities in economics
§ the absolute vertical vorticity (relative
vertical vorticity + Coriolis effect) in fluid dynamics
§ an index of refraction
Κ κ (kappa)
Kappa (κ) represents the following:
§ the Von Kármán constant
§ the kappa curve
§ the condition number of a matrix in numerical analysis
§ the connectivity of a graph in graph theory
Λ λ (lambda)
Lambda (λ) represents
the following:
§ function expressions in the lambda calculus
§ a general eigenvalue in linear algebra
§ the expected number of occurrences in
a Poisson distribution in probability
§ the arrival rate in queueing
theory
§ the average lifetime or rate parameter in
an exponential
distribution (commonly
used across statistics, physics, and
engineering)
§ the mean or average value (probability and
statistics)
Μ μ (mu)
Mu (μ) represents the
following:
§ the Möbius
function in number theory
§ the ring representation of a representation module
§ the population mean or expected value in probability and statistics
§ a measure in measure theory
§ the coefficient of friction in physics
Ρ ρ (rho)
Rho (ρ) represents the following:
§ the radius in a polar, cylindrical, or spherical coordinate
system
§ the correlation
coefficient in statistics
§ the sensitivity to interest rate in mathematical finance
§ density (mass or charge per unit volume)
Σ σ
(sigma)
Sigma (σ) represents the
following:
§ the sign of a permutation in the theory of
finite groups
§ the population standard deviation, a measure of spread in
probability andstatistics
§ a type of covalent bond in chemistry (sigma bond)
§ the selection operator in relational algebra
§ stress in
mechanics
§ electrical conductivity
Τ τ (tau)
Tau (τ) represents
the following:
§ an interval of time
§ a mean lifetime
§ torque, the rotational force in mechanics
§ the elementary tau lepton in particle physics
§ the lifetime of a spontaneous emission process
Χ χ (chi)
Chi (χ)
represents the following:
§ the chi distribution in statistics (χ
is the more frequently
encountered chi-squared
distribution)
is the more frequently
encountered chi-squared
distribution)
§ the chromatic number of a graph in graph theory
§ the Euler characteristic in algebraic topology
§ electronegativity in the periodic table
Ω ω (omega)
Omega (ω) represents the following:
§ the first infinite ordinal
§ the set of natural numbers in set theory (although N is
more common in other areas of mathematics)
§ an asymptotically dominant quantity related
to big O notation
§ in probability theory, a possible outcome of an experiment
§ angular velocity / radian frequency
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