This is not a specific software "feature" but rather a technical request often used in automotive, HVAC, and industrial forums to find wiring instructions for specific devices. Common examples include:
Labels like BN (Brown), BU (Blue), or G/Y (Green/Yellow) to identify physical wiring. jel shema podkljuchenija
Wiring the indoor and outdoor units to the power grid. This is not a specific software "feature" but
Standard icons for capacitors, relays, motors, and fuses. jel shema podkljuchenija
Finding the pinout for charging systems (e.g., for a Subaru Forester). Key Components Typically Found in These Diagrams: