The large dot signifies an electrical connection. Symbols shown are typical examples, not a complete list. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics. Symbols usage is sometimes unique to engineering disciplines, and national or local variations to international standards exist. The number of standards leads to confusion and errors. Australian Standard AS 1102 (based on a slightly modified version of IEC 60617 withdrawn without replacement with a recommendation to use IEC 60617).
It is referenced in ANSI Y32.2/IEEE Std 315. IEEE Std 91/91a: graphic symbols for logic functions (used in digital electronics).They have been extracted from the Appendix of the NMTBA Specification EGPl-1967. JIC JIC (Joint Industrial Council) symbols as approved and adopted by the NMTBA (National Machine Tool Builders Association).There is also IEC 61131-3 – for ladder-logic symbols.IEC 60617 (also known as British Standard BS 3939).The graphic symbols used for electrical components in circuit diagrams are covered by national and international standards, in particular:
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