The symbol on Custom audio wah pedals .. ?

[Stringmanipulator]

I'm wondering what does that symbol means? and what is the name of it ??

I'ts probably obvious but I've tried to search for different things like ..

wha pedal schematic symbols .. etc ..but haven't found it ..
so

thanks ladies and gents

 

[chris]

a switch, into an amp, into a resistor?

 

[Stephen13]

With a "tip" connection at the end?