A = 6.02x10^23 -- Avagadro's constant
B = E/c -- Magnetic field equals the electric field divided by the speed of light
C = 299792458 m/s -- The speed of light
D = sqrt[(X-x)^2+(Y-y)^2)] -- The distance between points (x,y) and (X,Y)
E = mc^2 -- Mass-Energy relation
F = ma -- Force equals mass times acceleration
G = 9.8 m/s^2 -- Acceleration due to gravity on Earth
H = 6.626x10^-34 J s -- Planck's constant
I = V/R -- Current equals voltage divided by resistance
J = Newton*meter -- Joule (unit of energy)
K = 8.9875*10^9 N*m^2/c^2 -- Boltzmann's constant
L = m(v x r) -- Angular momentum equals mass times the cross product of the velocity and radius
M = (Y-y)/(X-x) -- Slope equals the rise over the run
N = kg*m/s^2 -- A Newton (N) is a kilogram meter per second squared
O = (0,0,0) -- The origin is usually designated as an "O"
P = mv -- Momentum equals mass times velocity
Q = c*m*(delta)T -- Heat loss/gained equals the specific heat times the mass times the change in Temperature
R = v/w -- Radius equals velocity divided by angular velocity
S = E x B -- The Poynting vector
T = 2(pi)*sqrt(L/g) -- The period of a simple harmonic oscillator
U = mgh -- Potential energy equals mass times gravitational acceleration times height
V = dx/dt -- Velocity equals the change in position over time
W = F*d -- Work equals force times distance
X = [-b / sqrt(b^2 - 4ac)]/2a -- The quadratic equation
Y = F(x) -- Y is a function of X
Z = (delta)(lambda)/(lambda) -- Redshift (the change in wavelength divided by the rest wavelength)



As you can see from above, i have this list.but I'm realizing there are more symbols as i look in a calculus book. Then I notice that the capital and lower case symbols my have a different meaning.

Examples

V = dx/dt -- Velocity equals the change in position over time
v(lower case) = velicity

M = (Y-y)/(X-x) -- Slope equals the rise over the run
m(lower case) = mass

so where would i find a list of symbols of all and there meanings, as i feel this is very important to learn( of coarse)?

There aren't enough letters for everything so many of the letters and symbols used are context sensitive. In maths and physics i is always the square root of minus one .. in electrical angineering i is used for current (dQ/dt)* so j is used for the square root of minus one.

* Q is charge, d is an infinitely small interval and t is time. On a good day every text will define all the letters used - in reality all you need is years of practice and experience.