A an area; the vector potential.
a acceleration; a general constant.
B magnetic induction.
b a general constant.
C heat capacity.
c speed of light; a general constant.
D electric displacement.
d differential operator;
diameter; a distance.
energy; "electromotive force" (voltage).
E energy; electric field.
e 2.71828
; electron's charge.
F force; a general function; free energy.
f a fraction; a function as in f(x).
G Newton's universal gravitational constant.
g acceleration of gravity at Earth's surface.
Hamiltonian operator.
H magnetic field; enthalpy.
h Planck's constant; a height.
I electric current.
i
; an index (subscript); current.
unit vector in the x direction.
J spin angular momentum; electric current density.
j a common integer index; current density.
unit vector in the y direction.
K kinetic energy.
k an integer index; a general constant.
unit vector in the z direction.
L angular momentum; length.
l an integer index; a length.
M magnetization; mass.
m mass; an integer index.
N a large number.
n a small number.
"order of" symbol as in
.
o rarely used (looks like a zero).
P probability; pressure; power.
p momentum.
Q electric charge; quality factor.
q electric charge; "canonical coordinate".
R radius; electrical resistance.
r radius.
S entropy; surface area.
s a distance.
T temperature.
t time; thickness.
U potential energy; internal energy.
u an abstract variable; a velocity.
V volume; potential.
v velocity; an abstract variable.
W work; weight; charged vector boson.
w a small weight; a width.
X an abstract function like X(x).
x distance; any independent variable.
Y an abstract function like Y(y).
y distance; any dependent variable.
Z atomic number; Z(z); neutral boson.
z distance; any dependent variable.
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