Quadruplex may refer to: Quadruplex (New Orleans), a softball complex in New Orleans City Park Quadruplex telegraph, an improvement on the electrical telegraph patented in 1874 by Thomas Edison Two-inch quadruplex videotape, the first practical and commercially successful videotape format G-quadruplex, a four-stranded nucleic acid structure rich in guanine C-quadruplex, a four-stranded nucleic acid structure rich in cytosine, found in I-motif DNA Quadruplex, a building split into four apartments, similar to a duplex Quadruplex locomotive, a locomotive with four sets of driving wheels