| Subject | English | Thesaurus |
| avia. | basic instrument flight trainer | \ which is equipped with appropriate instruments, and which simulates the flight deck environment of an aircraft in flight in instrument flight conditions. |
| IT, abbr. | Basic Linear Algebra for Distributed Environments | BLADE |
| abbr., alg. | Basic Linear Algebra Subprograms | BLAS (CrazyAlex) |
| IT, abbr. | Basic Linear Algebra Subroutines | BLAS |
| softw., abbr. | Basic Local Alignment And Sequencing Tool | BLAST |
| progr., abbr. | Basic Logic | BL |
| abbr. | Basic M/E Tng | basic multi-engine training |
| abbr., comp. | Basic Message Switching Centre | BSC (Vosoni) |
| abbr. | Basic Reconfigurable Interactive Editing Facility | BRIEF |
| IT, abbr. | Network Termination for Basic Access | NTBA (ISDN) |
| abbr., modern | Straightedge. It has the same basic principle - No drink, No drugs, No sex - for all followers, but each person makes it their own. Straightedge has NOTHING to do with violence in fact, most straightedgers discourage it or religion that's a personal belief. | sXe (Some examples: some sXe people choose to be vegans or vegetarians, abstain from caffeine, save sex for marriage (as opposed to a serious, committed relationship). Franka_LV) |