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| Subject | English | Thesaurus |
| abbr., scottish | Capabilities And Requirement Demonstration SEBASS High Altitude Reconnaissance Program | CARD SHARP (USA) |
| abbr. | High Altitude Auroral Research Program | HAARP facility (MichaelBurov) |
| abbr. | High Altitude Auroral Research Program | project HAARP (MichaelBurov) |
| abbr., radio | High Altitude Auroral Research Program | HAARP (MichaelBurov) |
| abbr. | High Altitude Auroral Research Program | HAARP project (MichaelBurov) |
| abbr. | High Altitude Auroral Research Program | HAARP Program (MichaelBurov) |
| NASA, abbr. | High Altitude Auroral Research Program | HAARP |
| ecol., abbr. | High Altitude Pollution Program | HAPP |
| abbr., scottish | High Altitude Research Programme | HARP |
| ecol., abbr. | Medium Altitude Clear Air Turbulence Program | MEDCAT |
| abbr., oil | National High Altitude Photography Program | NHAP |
| abbr., scottish | Transition Altitude | TA |
| avia., Canada | transition altitude | The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes |