| _F_ | Faraday constant | _h_ | Planck’s constant |
| _G_ | Gravitational constant | _hbar_ | Dirac’s constant |
| _I0_ | Reference intensity | _k_ | Boltzmann constant. |
| _NA_ | Avogadro’s number | _kq_ | k/q (Boltzmann/charge of the electron) |
| _PSun_ | Power at the surface of the Sun | _lambda0_ | Photon wavelength (ch/e) |
| _REarth_ | Radius of the Earth | _lambdac_ | Compton wavelength |
| _RSun_ | Radius of the Sun | _mEarth_ | Mass of the Earth |
| _R_ | Constante universelle des gaz | _me_ | Electron rest mass |
| _Rinfinity_ | Rydberg constant | _mp_ | Proton rest mass |
| _StdP_ | Standard pressure | _mpme_ | Quotient mp/me (mass of the proton/mass of the electron) |
| _StdT_ | Standard temperature | _mu0_ | Permeability of vacuum |
| _Vm_ | Molar volume | _muB_ | Bohr magneton |
| _a0_ | Bohr radius | _muN_ | Nuclear magneton |
| _alpha_ | Fine structure constant | _phi_ | Magnetic flux quantum |
| _angl_ | 180 degree angle | _q_ | Charge of an electron |
| _c3_ | Wien displacement constant | _qe_ | Electron charge |
| _c_ | Speed of light in vacuum | _qepsilon0_ | q*epsilon0 (charge of the electron*permittivity) |
| _epsilon0_ | Permittivity of vacuum | _qme_ | Quotient q/me (charge/mass of the electron) |
| _epsilon0q_ | epsilon0/q (permittivity/charge of the electron) | _rad_ | 1 radian |
| _epsilonox_ | Dielectric constant of Silicon dioxide | _sd_ | Duration of a sidereal day |
| _epsilonsi_ | Dielectric constant | _sigma_ | Stefan-Boltzmann constant |
| _f0_ | Photon frequency (e/h) | _syr_ | Duration of a sidereal year |
| _g_ | Acceleration of gravity | _twopi_ | 2π
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