| Full Form | Category | Term |
|---|---|---|
| Fu*k you | Internet Slang | FU |
| File Upload | Networking | FU |
| Functional Unit | Softwares | FU |
| Feedback Unit | Electronics | FU |
| Formerly Undesirable | Messaging | FU |
| Flight Unit | Space Science | FU |
| Fuel | Space Science | FU |
| Foul Up | Space Science | FU |
| Formula Unit | Measurement Unit | FU |
| Future Unit | Measurement Unit | FU |
| Fluorescence Unit | Measurement Unit | FU |
| Fraction Unbound | Maths | FU |
| Finite Union | Maths | FU |
| Family Unit | Real Estate | FU |
| Football United | Sports | FU |
| Fighter Underground | Sports | FU |
| Fire Unit | Military and Defence | FU |
| Fart Underwater (submarine Sound) | Military and Defence | FU |
| First User | Military and Defence | FU |
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