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A part consists of one or more symbols.

If there are more than one symbols in the part then each symbol is called a sibling symbol.

In a part design, each symbol is defined on it's own symbol schematic. So, a part with 4 symbols will have 4 symbol schematics. Examples of a parts that has multiple symbols can be found in the class 74xxx logic family.

A part has one and only footprint design. The footprint is also known as a land pattern.