| item | description | category | filter | more on... |
| URN | Uniform Resource Name | IT/Software |
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| URN | Uniform Resource Name | IT/Networking |
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| URN | Uniform Resource Name | Governmental/US Gov. |
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| URN | Uniform Resource Name/Number | Uncategorized |
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| URN | Union Resources Network | Business/Firms |
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| URN | Unique Reference Number | Business/Accounting |
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| URN | University Radio Nottingham | Edu./Universities |
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| URN | Urine | Governmental/NASA |
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