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A diode with two arrows pointing towards it.
Also known as: Light-sensing diode, Photo diode
A photodiode generates or passes current when light falls on it, and is drawn as a diode with two arrows pointing inwards. Arrows pointing away from the body would make it a light-emitting diode, so the direction of two small arrows is the whole distinction.
Denotes a diode that responds to incident light, used for sensing and for optical communication.
Contexts: Technical drawing, Electrical equipment
Is distinguished from the light-emitting diode only by the direction of the arrows: inwards for a device receiving light, outwards for one emitting it.
Contexts: Technical drawing, Electrical equipment
A solid triangle pointing at a bar, with two parallel arrows pointing towards the triangle from outside.
The same diode with the arrows reversed.