@XKCD
XKCD #2818 Explained: Symbol Comic Description Comments Switch Drawbridge The symbol represents a physical on/off switch in a circuit, but also resembles a medieval drawbridge. Capacitor Overpass A capacitor is a component that can be used to hold electric charge, but also looks a bit like the map symbol for a highway overpass. Ground Pogo Stick This symbol represents a connection to "ground" (aka earth for folks in ...