ASME Y14.5 :
Dimensioning and Tolerancing
Two or more features to which a position or profile geometric tolerance is applied and that are grouped by one of the following methods: nX, n COAXIAL HOLES, ALL AROUND, ALL OVER, between A and B (A ? B), from A to B (A ? B), n SURFACES, simultaneous requirements, or INDICATED, where n in these examples represents a number.
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