Zip-cord

Zip-cord: In optical communications, a two-fiber cable consisting essentially of two single-fiber cables having their jackets conjoined by a strip of jacket material.

Note 1: This name is borrowed from electrical terminology referring to lamp cord. As with lamp cord, optical zip-cord may be easily furcated by slitting or tearing the two jackets apart, permitting the installation of optical connectors.

Note 2: Zip-cord cables include both loose-buffer and tight-buffer designs.

Source: from Federal Standard 1037C and from the FAA Glossary of Optical Communications Terms