The symbol for a resistor in a circuit diagram is typically represented as a simple zigzag line. The zigzag line is used to indicate a passive two-terminal electrical component designed to impede or limit the flow of electric current in a circuit. It doesn't matter whether the resistor is a fixed resistor, variable resistor (potentiometer), or any other type; the symbol remains the same.
The following is an example of what a resistor symbol looks like in a circuit diagram:
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______
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----| |----
|______|
The two vertical lines represent the terminals of the resistor, and the zigzag line between them represents the resistance element. The symbol does not convey the specific resistance value; that information is typically provided in the circuit diagram through a label or accompanying documentation.