A number of companies have developed their own sets of symbols, both for single-line and double-line drawings.

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Many companies have developed their own sets of symbols to represent various components and devices in electrical and electronic circuits, to ensure consistency and clarity in their diagrams and drawings. These symbols may vary slightly from the standard symbols used in industry-wide publications, but would be commonly understood within the context of the company's operations.

A Number of Companies Have Developed Their Own Sets of Symbols