The vector stencils library "Semiconductor diodes" contains 24 symbols of semiconductor diodes for drawing electronic schematics and circuit diagrams.
"In electronics, a diode is a two-terminal electronic component with asymmetric conductance; it has low (ideally zero) resistance to current in one direction, and high (ideally infinite) resistance in the other. A semiconductor diode, the most common type today, is a crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals. A vacuum tube diode has two electrodes, a plate (anode) and a heated cathode. Semiconductor diodes were the first semiconductor electronic devices. ...
Today, most diodes are made of silicon, but other semiconductors such as selenium or germanium are sometimes used." [Diode. Wikipedia]
The shapes example "Design elements - Semiconductor diodes" was drawn using the ConceptDraw PRO diagramming and vector drawing software extended with the Electrical Engineering solution from the Engineering area of ConceptDraw Solution Park.