# What does this symbol refer to?

What is the symbol that is below the C1 capacitor and R1 resistor. Is it the symbol of grounding?

• This question has little to recomend it - it doesn't seem that you did much work yourself to find an answer, and the answer is rather trivial. May 31, 2016 at 12:53

The symbol represents signal ground. This ground is often connected to the usual ground of a device, commonly known as "earth". However if a system is very sensitive the two grounds cannot simply be connected, but require a thorough engeneering approach and a good ground able to handle high currents.