What does this symbol stand for?

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The symbol 4πε0r^2 represents a formula in electromagnetism, where ε0 denotes the permittivity of free space, valued at approximately 8.85 x 10^-12 F/m. This constant is crucial as it relates the electric displacement vector to the electric field strength. The formula itself is integral in calculating the electric force between charged objects, emphasizing the relationship between charge, distance, and electric field strength.

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4πε0r^2

Thats 4pi (backwards 3 0) R squared.

I forget what the backwards 3 o stands for can someone help me out
 
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\epsilon_0? Permeability of free space. (Or is it permittivity? I always forget which)
 
\epsilon _0 is known as the permittivity of free space and is equal to about 8.85~ <br /> *~ 10^{-12}~~ F/m

It is a proportionality constant relating the electric displacement vector to the field strength.

OR, it can be thought of as a constant connecting electric field (or force) to the values of charge and distance.
 
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