| Abbreviation | Definition |
|---|---|
| BRT | Boundary Region Theory |
| BS | Baryon Strangeness |
| BSDM | Biased Site Disordered Model |
| BSM | Beam Simulation Method |
| BSM | Bell State Measurement |
| BSSI | British Superultramodern Scientific Institution |
| BSW | Basic Science World |
| BT | Beginning of Time |
| BTD | Basic Thermo-Dynamics |
| BTE | Brake Thermal Efficiency |
| BTFM | Basic Two Fluid Model |
| BTU | British Thermal Unit |
| BVF | Brunt-Vaisala Frequency |
| BVS | Blank, Void, and Scattering |
| BZ | Band Zero |
| BZ | Brillouin Zone |
| C | Charmed quark |
| C | Count |
| C | Speed of Light |
| C | The speed of light. |