| Abbreviation | Definition |
|---|---|
| BPPM | Best Practices Procurement Manual |
| BPSG | Boro PhosphoSilicate Glass |
| BQET | Benzenoid To Quinoid Exciton Transition |
| BR | Bridge Return |
| BRC | Bit-Rate Control |
| Break | form B (normally closed) contacts |
| BREFT | Bankers Realm Electronic Funds Transfer |
| BRGC | Binary Reflected Gray Code |
| BRIDGETT | BigRoundIndecisiveDynamicGirlElectricTipsyT**s |
| BRLESC | Ballistic Research Laboratories Electronic Scientific Computer |
| BS | Base Saturation |
| BS | Beam Splitter |
| BS | British Standard |
| BSC | Basic Spacing Between Centers |
| BSC | BCS (Bragg Crystal Spectrometer) Spectrally Calibrated |
| BSE | Back-Scaterred Electron |
| BSEC | Best Source Electronics Corporation |
| BSEE | Bachelor of Science in Electronics Engineering |
| BSES | Bombay Suburban Electric Supply |
| BSG | Binaural Signal Generator |