| item | description | category | filter | more on... |
| YO | The Youngest Or Only | Governmental/Military |
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| YO | Y-Axis of Orbiter | Governmental/NASA |
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| YO | Yard Oiler | Misc/Ship Types |
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| YO | Yarn Over | Misc/Chess |
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| YO | Years old | Medical/Physiology |
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| YO | Yoruba | Regional/Language Code /2 |
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| YO | Your Opportunity | Business/General |
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| YO | Youth Outing | Radio Stations |
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