| x | The X-Files X-Men The Last Stand X Window System X Window System protocols and architecture X Window core protocol |
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| x11 | X Window System |
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| xanadu | Xanadu House |
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| xenon | Xenon |
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| xenoplanet | Extrasolar planet |
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| xi | 11th century |
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| xii | 12th century Pope Pius XII |
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| xiii | 13th century |
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| xiv | 14th century Louis XIV of France |
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| xix | 19th century |
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| xl | Super Bowl XL |
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| xmas | Christmas Island |
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| xo | The Children's Machine |
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| xp | Windows XP |
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| xv | 15th century Rococo |
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| xvi | 16th century Neoclassicism Pope Benedict XVI |
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| xvii | 17th century |
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| xviii | 18th century |
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| xx | 20th century |
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