How To Build Reliable, Powerful, And Inexpensive Voltage Drops, Part 1: Resistors - When Less Is More Photo Gallery
The triangle pointing at the bar indicates that this symbol represents a diode. The arrows radiating from the symbol indicate that this diode emits light (LED). All diodes are basically check valves that pass energy in the direction of the triangle. Wiring them backward can turn an LED into a smoke-emitting diode.