Circuit 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.
The graphic symbols used for electrical components in circuit diagrams are covered by national and international standards, in particular:
Symbols usage is sometimes unique to engineering disciplines and national or local variations to international standards exist. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics.
Symbols shown are typical examples, not a complete list.
IEC-style trace junction
Trace crossing
Signal/Low noise ground (GND) symbol
IEC-style chassis-ground symbol
Single cell, multi-cell battery
Battery, multi-cell
Voltage source
Controlled voltage source
Current source
Controlled current source
AC voltage source
(a) resistor, (b) rheostat (variable resistor), and (c) potentiometer (All of them are American style symbols)
(a) resistor, (b) rheostat (variable resistor), and (c) potentiometer (All of them are IEC style symbols)
...
Wikipedia