| B | Flux density |
| BACT | Best Available Control Technology |
| BASE | Boston Area Semiconductor Education |
| BAW | Bulk Acoustic Wave |
| BC | Bias Contrast |
| BC | Buired Capacitance |
| BCAD | Business Computer-Aided Design |
| BCD | Binary Coded Decimal. |
| BCP | Biphase Communications Processor |
| BDS | Brownian Dynamics Simulation |
| BE | Boundary Element |
| BE | Bound Exciton |
| BE | Band Edge |
| BEC | Bose Einstein Condensation |
| BEEM | Ballistic Electron Emmission Spectroscopy |
| BEEP | Block Extensible Exchange Protocol |
| BER | Bit Error Rate |
| BF | Bright field |
| BFL | Buffered Field-effect-transistor Logic |
| BFO | Beat frequency oscillator |
| BFSR | Battlefield Surveillance Radars. |
| BG | Band Gap |
| BGA | Ball Grid Array |
| BGE | Band Gap Engineering |
| BHEL | Bharath Heavy electricals Limited |
| BI | Burn In |
| BICMOS | BIpolar Complementary Metal-Oxide Semiconductor |
| BIFET | Bipolar Field-Effect Transistor |
| BIM | Binary Intensity Mask |
| BIMOS | Bipolar Metal-Oxide Semiconductor |
| BIOS | Basic Input Output System. |
| BIS | Built-In Simulation |
| BIST | Built-In Self Test |
| BITE | Built-In Test Equipment |
| BJT | Bipolar Junction Transistor |
| BLD | Beam Lead Device |
| BLO | Binary Large Objects. |
| BMC | Bubble Memory Controller |
| BMP | Windows or OS/2 Bitmap image format |
| BNC | Bayonet Nut Coupling |
| BOE | Buffered Oxide Etchant |
| BOM | Bill Of Material |
| BOR | Bottom Of Range |
| BOSS | Binary Object Storage System |
| BPF | Band Pass Filter |
| BPR | Business Process Re-engineering |
| BPSK | Binary Phase Shift Keying. |
| BSE | Back Scaterred Electrons |
| BST | Bandwidth Segmented Transmission |
| BT | British Telecom |
| BTAB | Bumped Tape Automated Bonding |
| BTD | Bistable Thermal Donors |
| BTS | Base Transceiver Stations. |
| BTS | Base Transceiver Systems |
| BV | Breakdown Voltage |
| BW | Bandwidth |
| BWO | Backward Wave Oscillator |
| Baud | Signal level changes |
| Bhp | brake horsepower. |
| Bps | Bytes Per Second. |
| bps | Bits Per Second. |
| Bureaufax | International Public Facsimile Machine |
