6U or 6-U may refer to: IATA code for Air Ukraine One of the possible sizes of a rack unit, 10.50-inches (266.70mm) nominal. See rack mount. PW-6U, a model of Politechnika Warszawska PW-6 RG-6/U coaxial cable; see RG-6 6U, a model of Zenit (satellite) HY-6U, a model of Xian H-6 See also U6 (disambiguation)