During SPICE simulation, a SPICE model is used, and on the PCB design, it is represented by its footprint. On the schematic, the component is represented by a logical symbol. The physical component that is mounted on the completed printed circuit board is represented in a variety of ways. The symbol will appear on the schematic when it is edited, it shows the full set of component properties, including links to other domain models and its list of component parameters. Regardless of how the models and component definitions are stored, once the component is placed onto the schematic, it then becomes a unified design component. The organization of symbols into libraries should suit both the requirements of the company and the type of component library in which the symbol is destined to reside. Any number of component symbols can be created in a schematic library. Schematic symbols are created in a Schematic Library in Altium's Schematic Library editor and have the file extension *.SchLib. Schematic symbols are created by placing drawing objects to represent the component body and pins that represent the physical pins on the actual component. This type of component is also called a multi-part component. One component symbol can represent the entire physical component, or the component can be defined by multiple sub-parts where each sub-part represents some logical entity within the physical component (e.g., each AND gate in a quad AND gate component, or the coil and contact sets in a relay). This should be done to comply with the requirements of your organization and the design standards you choose to adopt. How a component is represented, i.e., the look of the symbol and arrangement of component pins, is up to the designer. The schematic symbol typically includes a shape that can reflect the function of the component and one or more pins.
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