Surface Charge Density - notation used

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Surface charge density is commonly represented by the lowercase sigma (σ), but it can also appear as σ with a subscript zero (σ₀). The notation σ typically refers to the surface charge density at a specific point or under certain conditions, while σ₀ may indicate a reference or initial surface charge density. The distinction between these notations is important for clarity in scientific communication. Understanding these differences aids in accurately interpreting electrostatic principles. Proper notation is essential for effective discussion and analysis in physics.
ZedCar
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Surface charge density is denoted with a lower case sigma: σ

Though sometimes I also see it denoted as σ with a subscript 0.

What is the difference in these notations?

Thank you.
 
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