X1, X-1 or X-one may refer to: Transportation Aircraft Bell X-1, the first aircraft to exceed the speed of sound in controlled level flight Automobiles BMW X1, a 2009–present German subcompact luxury SUV Geely Yuanjing X1, a 2017–2021 Chinese mini crossover Lada X-1, a 1981 Soviet concept MPV McLaren X-1, a 2012 British one-off sports car based on the 12C Red Bull X1, the former name of the Red Bull X2010, a fictional car created for the game Gran Turismo 5 Wrightspeed X1, a 2008 electric sports car prototype based on the Ariel Atom Bus routes X1 (Metrobus), a bus route in Washington, District of Columbia, United States X1 (New York City bus), a bus route in New York City, New York, United States X1 Steel Link, a bus rapid transit service between Sheffield, Rotherham, and Maltby in England, United Kingdom Excel X1, a bus route from Lowestoft to Peterborough in England, United Kingdom X1 Glasgow–Hamilton, a former bus route in Scotland Cycles Sinclair X-1, an electrically assisted faired recumbent bicycle Yamaha X-1, a commuter-style motorbike Rail transport SL X1, a former Swedish commuter train built by ASEA LNER Class X1, a single locomotive rebuilt several times in its history Watercraft X1 (dinghy), a fast, light-weight sailing dinghy designed for inland racing X-1 Submarine, the United States Navy's only midget submarine HM Submarine X1, a Royal Navy submarine Technology Sharp X1, a Japanese home computer manufactured by the Sharp Corporation Xbox One, a video game console a one-lane PCI Express slot Cray X1, a supercomputer sold since 2003 Electrologica X1, an early Dutch computer Sony Ericsson XPERIA X1, a mobile phone ThinkPad X1 Carbon, a high-end notebook computer released by Lenovo in 2012 X1 (software company) formerly known as X1 Technologies, Inc. Tegra X1, a system on a chip released by Nvidia in 2015 X1, an IPTV-based cable television hardware platform developed by Comcast Arts, entertainment, and media X1 (band), a South Korean boy band formed through Produce X 101 X1 (rapper) (1979–2007), American rapper X Minus One, a 1950s American radio show X-Men (film), the first film in the X-Men franchise X-One, monthly magazine produced by Imagine Publishing Other x −1, the multiplicative inverse of x (another way to denote 1⁄x, one divided by x) Cygnus X-1 and Scorpius X-1, two astronomical x-ray sources M82 X-1, a candidate intermediate-mass black hole detected in January 2006 United States patent X1,