Electronic symbol

[2] Symbols usage is sometimes idiosyncratic to engineering disciplines, and national or local variations to international standards exist.

It is very common for potentiometer and rheostat symbols to be used for many types of variable resistors and trimmers.

The words anode and cathode aren't part of the diode symbols.

"K" is often used instead of "C", because the origin of the word cathode is kathodos, and to avoid confusion with "C" for capacitors in silkscreen of printed circuit boards.

[6] Note: The pin letters B/C/E and G/D/S aren't part of the transistor symbols.

Depending on the IC, the two-input gates below may have: 1) two or more inputs; 2) infrequently some have a second inverted Q output too.

For the symbols below: Q is output, Q is inverted output, E is enable input, internal triangle shape is clock input, S is Set, R is Reset (some datasheets use clear (CLR) instead of reset along the bottom).

Common circuit diagram symbols (US ANSI symbols)
Wire crossover symbols for circuit diagrams . The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style symbol, which means the exact opposite. The newer, recommended style for 4-way wire connections in both CAD and non-CAD schematics is to stagger the joining wires into T-junctions. The large dot signifies an electrical connection.