Note: This list can be expanded further.

Å — angstrom

**A** — ampere, area, a blood type, a spectral type, vector potential, Work

**B** — B meson, a blood type, boron, luminance, magnetic field, a spectral type

**C** — carbon, degrees Celsius, set of complex numbers, coulomb, molar heat capacity, the C programming language, specific heat capacity, Cunningham correction factor

**D** — deuterium, differential operator, electric displacement, D meson

**E** — electric field, energy, SI prefix *exa–*, expected value

**F** — degrees Fahrenheit, farad, fluorine, force, Helmholtz free energy, a spectral type

**G** — Einstein tensor, SI prefix *giga–*, Gibbs free energy, gravitational constant, Green’s function, Momentum, a Spectral type

**H** — auxiliary magnetic field, enthalpy, Hamiltonian, Hankel function, Heaviside step function, henry, Higgs boson, homology group, Hubble constant, hydrogen, set of quaternions, hat matrix

**I** — current, iodine, impulse, luminous intensity, moment of inertia

**J** — angular momentum, Bessel function of the first kind, current, joule

**K** — kaon, kelvin, potassium, sectional curvature, a spectral type

**L** — angular momentum, inductance, Lagrangian, litre, a spectral type

**M** — magnetization, mass, SI prefix *mega–*, a spectral type, torque

**N** — Avogadro’s number, Bessel function of the second kind, set of natural numbers, newton, nitrogen, normal distribution, normal vector

**O** — big O notation, a blood type, oxygen, a spectral type

**P** — Legendre polynomial, luminous flux, phosphorus, polarization, power, pressure, probability, projection

**Q** — electric charge, quantity of heat, set of rational numbers, flow rate

**R** — curvature tensor, electrical resistance, radius, set of real numbers

**S** — area, entropy, siemens, sphere, spin operator, sulfur, symmetric group

**T** — a spectral type, temperature, tesla, tritium

**U** — potential energy, uranium, unitary operator

**V** — potential energy, vanadium, volt, voltage, volume

**W** — energy, Lambert’s W function, tungsten, watt, W boson, Work, work function, Wiener process

**X** — random variable, abscissa

**Y** — Bessel function of the second kind, SI prefix *yotta–*, yttrium, ordinate, luminance

**Z** — atomic number, impedance, set of integers, partition function (statistical mechanics), partition function (quantum field theory), Z boson, SI prefix *zetta–*, altitude

**a** — SI prefix *atto–*, acceleration, reflectance

**b** — Bottom quark

**c** — SI prefix *centi–*, Charm quark, speed of light, speed of sound

**d** — SI prefix *deci–*, distance, Down quark, infinitesimal increment, differential operator

**e** — Napier’s constant, electron, positron, electric charge

**f** — SI prefix *femto–*, frequency

**g** — gram, gravitational acceleration, gravitational field, distance metric of spacetime

**h** — height, hour, Planck’s constant, spherical Hankel function

**i** — imaginary complex unit, imaginary quaternion unit, unit vector, current, row index

**j** — electric current and current density, radiant intensity, spherical Bessel function of the first kind, unit vector, column index, imaginary complex unit, imaginary quaternion unit

**k** — Boltzmann constant, imaginary quaternion unit, SI prefix *kilo–*, wave vector, unit vector

**l** — length, litre, mean free path

**m** — magnitude, mass, SI prefix *milli–*, metre, minute

**n** — SI prefix *nano–*, neutron, refractive index, spherical Bessel function of the second kind

**o** — small o notation

**p** — electric dipole moment, momentum, SI prefix *pico-*, proton, point of a space

**q** — electric charge, generalized coordinate

**r** — position (vector), radial polar coordinate, radius

**s** — second, Strange quark

**u** — Up quark

**v** — velocity

**w** — velocity

**x** — abscissa, real-valued argument, variable to be determined, vector,

**y** — ordinate, SI prefix *yocto-*, pixel row index

**z** — complex variable, altitude, SI prefix *zepto-*

### Greek

**Β** — Beta function

**Γ** — Angular momentum, Gamma function, Christoffel symbols

**Δ** — A macroscopic change in the value of a variable, Laplace operator, Delta particle

**Λ** — Iwasawa algebra, Lorentz transformation, Lambda Hyperon

**Ξ** — Cascade Hyperon

**Π** — Product

**Σ** — Sum, Surface, Sigma Hyperon

**Φ** — Alternative symbol for Quantum mechanical wavefunction

**Ψ** — Quantum mechanical wavefunction

**Ω** — Chaitin’s constant, Ohm, Solid angle, Omega Hyperon

**α** — Alpha particle, Fine structure constant, Angular acceleration

**β** — Beta particle, Inverse temperature

**γ** — Euler-Mascheroni constant, Gamma-ray (Photon), Photon, Relativistic gamma factor

**δ** — Dirac delta function, Infinitesimal quantity, Kronecker delta

**ε** — Infinitesimal quantity, Permittivity

**ζ** — Damping Ratio, Riemann zeta function

**η** — Distance metric of flat spacetime, Efficiency, Dynamic viscosity, η-meson

**θ** — Angle, Angular polar coordinate, Temperature

**ι** –

**λ** — Half-life, Lagrangian multiplicator, Lambda expression, Thermal conductivity, Wavelength

**μ** — Absorption coefficient, Chemical potential, Magnetic dipole moment, Mean, SI prefix *micro–*, Micron, Muon, Permeability, Reduced mass

**ν** — Frequency, Kinematic viscosity, Neutrino

**ο** –

**π** — Fundamental group, Conjugate momentum, Homotopy groups, Number π, Pion, Prime-counting function, Projection

**ρ** — Density, Electrical resistivity, Radial polar coordinate, ρ-meson

**σ** — Cross section, Electrical conductivity, Spin, Standard deviation, Stefan-Boltzmann constant

**τ** — Tau lepton, Torque, Shear stress, Time constant

**υ** –

**φ** — Angular polar coordinate, Electric potential, Euler’s totient function, Golden mean, Phase, Potential energy

**ψ** — Quantum mechanical wavefunction, J/ψ particle

**ω** — Frequency (in radian/s), angular velocity

**Ш** — Tate-Shafarevich group (**Ш**(*G*))

**ℵ** — Cardinality of infinite sets

**ב** — Cardinality of infinite sets

**∇** – Del operator, Gradient, Divergence, Curl

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