Standards for symbols
– IEC 60617 (BS 3939)
– IEC 61131-3 (ladder-logic symbols)
– JIC symbols (approved by NMTBA)
– ANSI Y32.2-1975 (IEEE Std 315-1975, CSA Z99-1975)
– IEEE Std 91/91a (logic function symbols)
Common electronic symbols
– Traces (wire crossover symbols)
– Grounds (general, signal/low-noise, chassis)
– Sources (battery, solar cell, DC/AC voltage, current)
– Resistors (potentiometer, rheostat, photoresistor, thermistor, varistor)
– Capacitors (general, polarized, variable, ganged, trimmer)
Diodes
– Various diode symbols (with or without filled triangle)
– Single-phase bridge rectifier symbols (with or without internal circuit)
– Transistor symbols (optional circle)
– Relay symbols (SPST, SPDT, DPST, DPDT)
Lamps
– LED (located in diode section)
– Logic gate symbols (AND, OR, NOT, XOR, etc.)
– Buffer gate with schmitt trigger input
– Flip-flop symbols (SR, D, JK, T)
– OpAmp symbols (operational amplifier, comparator)
Miscellaneous devices
– Oscillator symbols (crystal, ceramic resonator)
– Hall-effect sensor
– Gas-discharge tubes (GDT) for ESD discharge
– Spark gap for ESD discharge
– Historical electronic symbols (obsolete capacitor symbols) Source: https://en.wikipedia.org/wiki/Electronic_symbol
An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering discipline, based on traditional conventions.
