| Acronym | Meaning |
| HWHM | Half Width At Half-maximum |
| NIST | National Institute Of Standards And Technology (formerly NBS) |
| SU | Standard Unit |
| AQTAD | Air-Quality Technical Assistance Demonstration |
| SWAT | Soil Water Assessment Tool |
| ASTROS | Automated Structural Optimization System |
| LPFG | Long-period Fiber Grating |
| TVS | Triangular Voltage Sweep |
| EST | External Standardization Technique |
| CPFD | Coupled-pair Functional With Double Excitation |