Panel indicators, also known as pilot lights or indicator lamps, are small light-emitting devices installed on control panels, machinery, instruments, and electronic equipment to provide visual indication of operational status, fault conditions, or system alerts. These indicators typically use light-emitting diodes (LEDs) or incandescent bulbs to emit colored light corresponding to specific operating states or functions. Panel indicators come in various shapes, sizes, and colors, and they play a crucial role in enhancing situational awareness, facilitating troubleshooting, and ensuring safe and efficient operation of equipment and systems across diverse industries and applications.