This Standard sets forth principles governing the formation of graphical symbols for logic diagrams in which connections between symbols are generally shown with lines. Definitions of logic functions, the graphical representations of these functions, and examples of their application are given. 1.2.1 Two different but overlapping sets of graphical symbols are presented in this Standard: Uniform Shapes and Distinctive Shapes. For some functions there are different symbols in the two sets; for others the symbol is the same in both sets. Symbols from the non-overlapping parts of the two sets are not permitted on the same logic diagram. 1.2.2 This Standard defines the requirement for logic diagrams. The presentation, in some cases, extends beyond the area of logic functions in order to preserve the context of symbology relating to logic diagrams
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