| Rank | Abbreviation | Meaning |
|---|
| ***** | FIRST | Fraunhofer-Institut für Rechnerarchitektur Und Softwaretechnik
| |
| **** | FIRST | Forschungsinstitut für Rechnerarchitektur und Softwaretechnik
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| **** | FIRST | Federal Information Research Science and Technology
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| *** | FIRST | First Industrial Results of Semantic Technologies
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| *** | FIRST | ForschungsInstitut fuer Rechnerarchitektur und SoftwareTechnik
| |
| *** | FIRST | Fuzzy Systems and Intelligent Technologies Research Society of Thailand
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| *** | FIRST | Forum of Incident Response Teams
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| *** | FIRST | Fully Integrated Routing Switch Technology
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| *** | FIRST | Forum of Incident Response and SecuriTy
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| *** | FIRST | Future's Inventory Replenishment System Technology
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| ** | FIRST | Flexible Infra Red Search and Track
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| ** | FIRST | Fast Interactive Retrieval System Technology
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| * | FIRST | First Independent Research Support and Transition
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| * | FIRST | Fast Interactive Radio System Tool
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| * | FIRST | Fourier Interferometer for Random Source Transient
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