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One of four 16-bit general purpose cpu registers in the x86 arcitecture.

compare: ax, bx, cx.

This juxtaposition of letters has a few meanings:

DX: Whacked-out Japanese abbreviation for deluxe. For example: Tetris DX.

Dx (where x is a number): A single die with x sides.

dx (note that the d is traditionally typeset in roman): Leibniz's notation for the differential amount of x.

δx: The partial derivative of x.

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