Basing diagram
Encyclopedia
A basing diagram shows or describes the “pins” of an electronic component
Electronic component
An electronic component is a basic electronic element and may be available in a discrete form having two or more electrical terminals . These are intended to be connected together, usually by soldering to a printed circuit board, in order to create an electronic circuit with a particular function...

. This part usually has more than two pins, so a basing diagram is needed to show which pin does what. Many basing diagrams also show dimension
Dimension
In physics and mathematics, the dimension of a space or object is informally defined as the minimum number of coordinates needed to specify any point within it. Thus a line has a dimension of one because only one coordinate is needed to specify a point on it...

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