| item | description | category | filter | more on... |
| XO | Executive Officer | Governmental/Military |
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| XO | Extra Old | Misc/Food |
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| XO | Orbiter Structural Body Reference, X-Axis | Governmental/NASA |
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| XO | X'd Out | Uncategorized |
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| XO | X-Axis of Orbiter | Governmental/NASA |
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| XO | Xanthine Oxidase | Medical/Human Genome |
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