A triangle pointing at a bar, marking a diode.
Also known as: Rectifier symbol, Triangle and line symbol, One-way valve symbol
A triangle meeting a flat bar marks a diode, and the drawing encodes its behaviour: current passes in the direction the triangle points and is blocked by the bar in the other. It is one of the few schematic symbols that explains itself.
Marks a diode: a component that allows current to pass in one direction and blocks it in the other.
Contexts: Electrical equipment
Encodes its own behaviour in its shape — conventional current flows in the direction the triangle points, and the bar at the triangle's tip represents the barrier in the reverse direction.
Contexts: Electrical equipment
Names its two terminals anode and cathode, the cathode being the barred end, which is marked on the physical component by a printed band.
Contexts: Electrical equipment
Takes modified forms for related components: a Zener diode bends the bar into a shallow Z, and a Schottky diode squares it into an S shape.
Contexts: Electrical equipment
A solid triangle lying on its side with a short bar drawn across its pointed tip, perpendicular to the wire running through both.
The LED symbol is the diode symbol with two small arrows added; without them the two are identical.