| Subject | English | Thesaurus |
| aeron., abbr. | Air Speed Indicator Reading | ASIR |
| abbr., scottish | Fuel Indicator Reading | FIR |
| telecom., abbr. | Payload Defect Indicator - Path | PDI-P |
| telecom., abbr. | Remote Defect Indicator - Path | RDI-P |
| telecom., abbr. | Remote Defect Indicator - Path Level | RDI-P (SONET) |
| telecom., abbr. | Remote Error Indicator - Path Level | REI-P (SONET) |