X1
X1 stands for:
- ATI Mobility Radeon X1 series , series of graphics processors for notebooks
- ATI Radeon X1 series , series of desktop graphics chips from AMD
- Bell X1 , Irish band from Celbridge, County Kildare
- BMW X1 , Sport Utility Vehicle from the manufacturer BMW
- Electrologica X1 , formerly a digital computer
- House X1 , listed residential building in Cologne-Hahnwald
- Sharp X1 , home computer range
- SL X1 , train type in Sweden
- Sony Ericsson X1 , smartphone
- Wrightspeed X1 , Prototype Sports Car (Roadster)
- X1 , class of interference suppression capacitors
- X1 , special feature of suitability grade T1
X-1 stands for:
- Bell X-1 , American experimental and rocket aircraft
- Circinus X-1 , X-ray double star in the constellation Circle
- Cygnus X-1 , X-ray binary star in the constellation Swan
- Hercules X-1 , X-ray pulsar
- Scorpius X-1 , X-Ray Source; about 9,000 light years from Earth
- X-1 (submarine) , the US Navy’s only small submarine
