What does a rectangle symbolize in a TPC schematic?

In a TPC schematic, a rectangle typically symbolizes a relay or a specific electrical device or component. This representation is part of standardized symbols used in electrical and electronic schematics to maintain a clear and consistent way of conveying information. Rectangles are distinct and easily recognized, making them ideal for illustrating components that serve varied functions within a circuit, such as relays which open or close circuits based on control signals. Recognizing this symbol is essential for understanding how the component interacts with other parts of the circuit, ensuring accurate interpretation of the schematic.