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Duplex, meaning double or twofold, may refer to various things:
Duplex can refer to a double stranded molecule of DNA or RNA.
Duplex can refer to a concurrency (road) involving two highways sharing the same roadbed .
A "duplex reticle" in shooting terminology is a type of crosshairs reticle that is thicker on the edges, tapering to thin in the center of the scope's sight picture. The thicker sections are easier to see against a dark background and the thin lines offer a more precise aiming point, obscuring less of the target.
Duplex printing is the ability of a computer printer to print on both sides of a page
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