Physics reference
Symbols
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PhysRef
Some common symbols used for variables in physics.

Note.
This list is by no means complete.
Symbols.
a
acceleration
b
impact parameter
c
the speed of sound; the speed of light in vacuum
d
distance
e
eccentricity; Naperian logarithm base
f
frictional drag
g
acceleration due to gravity; gravitational field strength; metric tensor
h
Planck's constant
i
imaginary unit; Cartesian x-axis basis unit vector
j
impulse; Cartesian y-axis basis unit vector
k
Boltzmann constant; spring constant; Cartesian z-axis basis unit vector
l
length; angular momentum
m
mass
n
number; number density; refraction index
p
momentum; pressure
q
deceleration parameter; charge
r
distance; position
s
arc length
t
time; dimensionless parameter
u
four-velocity; relativistic mass; energy density
v
speed; velocity
w
weight
x
position
z
redshift
A
atomic mass
B
magnetic flux density; binding energy; bulk modulus
C
capacitance
D
electric displacement
E
energy; electric field strength
F
force; vector field
G
universal constant of gravitation; Einstein tensor
H
magnetic field strength
I
action; intensity; moment of inertia; electric current
J
current density
K
kinetic energy
L
inductance; luminosity
M
magnetization; moment
N
normal vector; atomic number
P
power; pressure; polarization
Q
heat
R
resistance; radiancy; Ricci tensor
S
Poynting vector
T
temperature; tangential vector
U
potential energy
V
voltage; potential
X
hydrogen ratio
Y
helium ratio; Young modulus
Z
metals (not H, He) ratio; impedance; proton number
alpha
angular acceleration; fine structure constant
beta
velocity in terms of c
gamma
Einstein factor
delta
change
epsilon
electric constant; small value, 0 < e << 1; energy density
eta
efficiency
theta
angular displacement
kappa
torsion constant
lambda
propert length; wavelength
mu
magnetic constant; proper mass
nu
frequency
pi
circumference-to-diameter ratio; parallax
rho
density
sigma
Stefan-Boltzmann constant; surface charge density
tau
torque; proper time; inverse Einstein factor
phi
angular displacement
khi
susceptibility
omega
angular velocity
Gamma
"gamma function"; Christoffel symbols
Delta
change
Theta
step function
Lambda
cosmological constant
Pi
repeated product
Sigma
repeated sum
Phi
field strength
Psi
wavefunction
Omega
angular precession velocity; solid angle
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