Varistor Schematic Symbol

The schematic symbol for a varistor is:

This is the most common type of symbol found for varistors in schematic diagrams.

Example circuit

An example circuit with a varistor is shown below:

You can see the varistor is in parallel to the circuit to the right. Since a varistor's task to clamp excess voltage down to ground, it is put in parallel to electronic circuitry which we want to protect.