2. <language> A systems language written by Ken Thompson in 1970 mostly for his own use under Unix on the PDP-11. B was later improved by Kerninghan(?) and Ritchie to produce C. B was used as the systems language on Honeywell's GCOS-3.
[Features? Differences from C?]
3. <language> A simple interactive programming language designed by Lambert Meertens and Steven Pemberton. B was the predecessor of ABC. B was the first published (and implemented) language to use indentation for block structure.
["Draft Proposal for the B Language", Lambert Meertens, CWI, Amsterdam, 1981].
4. <language, specification> A specification language by Jean-Raymond Abrial of B Core UK, Magdalen Centre, Oxford Science Park, Oxford OX4 4GA. B is related to Z and supports development of C code from specifications. B has been used in major safety-critical system specifications in Europe, and is currently attracting increasing interest in industry. It has robust, commercially available tool support for specification, design, proof and code generation.
bit or maybe byte (B).