| FAS | fire alarm system |
| FED | fixed extinguishing devices |
| ESS | electronic security system |
| AWS | audio warning system |
| MCP | manual call point |
| kg(t) | availability coefficient |
| µ | recovery rate coefficient |
| λ | failure rate coefficient |
| RO(t) | probability function of an FAS staying in the SPZ state (full fitness) |
| QZB(t) | probability function of an FAS staying in the SZB state (safety hazard) |
| QB(t) | probability function of an FAS staying in the SPZ state (safety unreliability) |
| λZB1 | failure rate, transition of a selected FAS from the SPZ state to the SZB state |
| μPZ1 | recovery rate, transition from the SZB state to the SPZ state |
| TF 1–TF 9 | test fire designations |
| AFSTD | alarm and failure signal transmitting device |
| PD1 | detection loop No. 1 |
| λCSP | intensity of transition from the SPZ state of full fitness to the SB state of safety unreliability |
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