Double subscript notation

Type of notation used in engineering documentation

In engineering, double-subscript notation is a notation used to indicate some variable between two points. In electronics, the notation is usually used to indicate the direction of current or voltage, while in mechanical engineering it is sometimes used to describe the force or stress between two points, and sometimes even a component that spans between two points. Although there are many cases where multiple subscripts are used, they are not necessarily called double subscript notation specifically.

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