Acronym |
Definition |
| XV-5 | Vertifan Experimental Tilt-Rotor Aircraft |
| XVERS | Transverse |
| XVL | External Video Link |
| XVS | eXternal Vision System |
| XVV | X-axis towards Velocity Vector |
| XW | X-Wing |
| XYP | X- Y Plotter |
| XYR | X- Y Recorder |
| Y | Width of vehicle or structure - Horizontal Axis |
| Y | Yaw |
| Y | Y-axis |
| Y' | Y-axis Rate of Change |
| Y'' | Y-axis Rate of Acceleration |
| Y''' | Y-axis rate of change of Acceleration |
| YAR | Yarragadee, Western Australia, Spaceflight Tracking and Data Network Site |
| YBG | Your Best Guess |
| YD | Yard |
| YEA | Yaw Error Amplifier |
| YES | Young Engineers' Satellite |
| YL | Y-axis of SpaceLab |
| YMME | Year, Make, Model, and Engine |
| YO | Y-axis of Orbiter |
| YOC | Yearly Ownership Cost |
| YP | Yearly Plan |
| YP | Y-axis of Payload |
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