Acronym |
Definition |
| XIC | Type XI-C German U-Boat, WW II |
| XJD-1 | Douglas Invader Experimental aircraft |
| XJL-1 | Columbia JL-1 Experimental aircraft |
| XJQ-1 | Fairchild JQ-1 Experimental Aircraft |
| XJQ-2 | Fairchild JQ-2 Experimental Aircraft |
| XJW-1 | Waco JW-1 Experimental utility aircraft |
| XL | Excel |
| XLD | Extra Light Duty |
| XLIV | Forty Four Roman Soldiers |
| XLWB | Extra Long Wheel Base |
| XM | Xtreme Military |
| XM-1 | Prototype M-1 Abrams Tank |
| XM-2 | Prototype M-2 Bradley Infantry Fighting Venicle |
| XMTL | Transmittal |
| XMTR | Transmitter |
| XNF | X/ Open Federated Naming |
| XNK-1 | Keystone Experimental Trainer Aircraft |
| XNL-1 | Langley Experimental Trainer Aircraft |
| XNQ-1 | Fairchild Experimental Trainer Aircraft |
| XO | Executive Officer |
| XPLRS | X-Windows Position Location and Reporting System |
| XPO | Executive Petty Officer (US Coast Guard) |
| XQM-103 | Teledyne Ryan Experimental AQM-103 Firebee |
| XR | Experimental Rifle |
| XRK-1 | Kinner RK- Experimental Transport Aircraft |
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