| Meaning | Category |
| Facility Interface Sheets | Governmental->NASA |
| Fake Information System | Internet->Chat |
| Fault Isolation System | Academic & Science->Electronics |
| Financial Information Strategy | Business->Accounting |
| Financial Information System | Business->Accounting |
| Fixed Income Securities | Business->Stock Exchange |
| Foreign Intelligence Service | Governmental->Military |
| Frame Information Structure | Computing->Hardware Computing->Drivers |
| Free In Store | Business->Accounting |
| Frente Islámico de Salvación | International->Spanish |
| Friendly Information System | Governmental->Military |
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