| Acronym | Meaning |
| PTRI | Programmed Temperature Retention Index |
| IST | Internal Standardization Technique |
| PBIRG | Pharmaceutical Business Intelligence And Research Gro |
| PTGS | Picosecond Transient Grating Spectroscopy |
| GIXS | Grazing Incidence X-ray Scattering |
| PNO-CI | Pseudonatural Orbital-configuration Interaction |
| EELS | Electron Energy Loss Spectroscopy |
| LCR | Locus Control Region |
| MEDLARS | Medical Literature Analysis And Retrieval System (NLM) |
| BAPMON | Background Air Pollution Monitoring Network |