| Acronym | Meaning |
| RONALD | Rocketborne Optical Neutral Gas Analyzer With Laser Diodes |
| RHO | Reduced Hamiltonian Orbital Method |
| ABC | ATP-binding Cassette |
| RFGD | Radio-frequency Glow Discharge |
| UOP | Universal Oil Products |
| ARPES | Angle-resolved Photoelectron Spectroscopy |
| COSCAT | Coherent Scatter System |
| NARA | United States National Archives And Records Administration |
| FXR | Farnesoid X Receptor |
| APRIL | A Proliferation-inducing Ligand |