In fiber optics, the critical angle is described with respect to the parallel axis running down the middle of the fiber.

Keep their relative bearing on the parallel axis.

Two external helical gears operating on parallel axes must be of opposite hand.

For increased efficiency, parallel axes may be calculated as a single axis.

A polygonal shape is created from four parallel horizontal axes extending on either side of a vertical zero axis.

However, it may be necessary to calculate the second moment of area with respect to a different, parallel axis, say the axis.

A similar statement can be made about the axis and the parallel centroidal axis.

Or, in general, any centroidal axis and a parallel axis.

The prosoma (head) was subtrapezoidal, with arcuate compound eyes on parallel axes.

The extremely simple, narrow building in Cannstatt had ten parallel axes and a side projection.