Variables commonly used in physics

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Symbol	Meaning	SI Unit of Measure
$\mathbf{E}$	electric field	volt per meter
$\mathbf{H}$	magnetic field strength	ampere per meter
$\mathbf{D}$	electric displacement field	coulomb per square meter
$\mathbf{B}$	magnetic flux density also called the magnetic induction.	tesla, or equivalently, weber per square meter
$\ \rho \$	free electric charge density, not including dipole charges bound in a material	coulomb per cubic meter
$\mathbf{J}$	free current density, not including polarization or magnetization currents bound in a material	ampere per square meter
$d\mathbf{A}$	differential vector element of surface area A, with infinitesimally small magnitude and direction normal to surface S	square meters
$dV \$	differential element of volume V enclosed by surface S	cubic meters
$d \mathbf{l}$	differential vector element of path length tangential to contour C enclosing surface S	meters
$\nabla \cdot$	the divergence operator	per meter
$\nabla \times$	the curl operator	per meter
$\mathbf{F}$	force	newtons
$\mathbf{p}$	momentum	kilogram-meters per second
$t$	time	seconds
$q$	electric charge	coulombs
$\mathbf{v}$	velocity	meters per second
$ω$	angluar frequency or angular speed	radians per second
$T$	periodicity	seconds
$f$	frequency	hertz
$v$	tangential velocity of a point about the axis of rotation	meters per second
$r$	radius of rotation or distance between two masses	meters
$G$	the gravitational constant	newton meters squared per kilogram squared
$m$	mass	kilograms
$a$	acceleration	meters per second squared
$Λ$	cosmological constant	1 / seconds squared
$λ$	wavelength	meter
$τ$	torque	newton meters
$\mathbf{\mu}$	magnetic moment	ampere square meters
d	impact parameter
d	distance	meters
e	eccentricity
ℎ	Planck's constant	joule seconds
ℏ	The reduced Planck's constant	joule seconds
i	intensity; Cartesian x-axis basis unit vector
j	Cartesian y-axis basis unit vector
$k$	Boltzmann constant; Cartesian z-axis basis unit vector	joules per kelvin
n	refraction index; principal quantum number
p	pressure	pascals
q	charge
s	arc length
u	four-velocity; relativistic mass; energy density
H	Hamiltonian; magnetic field strength
I	action; intensity; electric current	amperes
J	current density	amperes per square meter
K	kinetic energy	joules
L	inductance; luminosity	henries; candelas per square metre
M	magnetization; moment
N	normal vector; atomic number
P	power	watts
Q	Electric Charge	coulombs
R	Electrical resistance; Ricci tensor; radiancy	ohms
T	Thermodynamic Temperature	kelvins
U	potential energy	joules
V	voltage	volts
$α$	angular acceleration; fine structure constant
$β$	velocity in terms of c	299,792,458 meters per second
$γ$	Lorentz factor
$ε$	electric constant	farads per meter
$η$	efficiency or viscosity
$Θ$	angular displacement	radians
$Κ$	torsion constant	newton meters per radian
$ν$	frequency	hertz
$ρ$	density	kilograms per cubic meter
$Φ$	field strength
$Ψ$	wavefunction