Understanding the private printing symbols on a PCB board is actually very simple. The first letter of the symbol is usually the English abbreviation of the component. For example, "c" represents capacitors, "u" represents integrated circuit chips, "r" represents resistors, "d" represents diodes, "q" represents transistors, and "L" represents inductors.
 
The subsequent numbers are often used to distinguish the circuit's functional areas. For example, "1" may only be associated with the motherboard circuit, and "2" may only be associated with the power circuit. The third and fourth digits of the symbol indicate the sequence number of the component among its同类components on the PCB.
 
Taking "R107" as an example, it represents the 7th resistor in the motherboard circuit area. Similarly, "G118" identifies the 18th capacitor on the motherboard. Are these symbols easier to understand now?