| ANSCII | American National Standard Code for Information Interchange |
|---|---|
| ASCII | American Standard Code for Information Interchange |
| atm | standard atmosphere |
| BS | Bachelor of Science; Bachelor of Surgery; Bacillus subtilis; Bartter syndrome; base strap; bedside; ... |
| BSU | Bartholin, Skene, urethral [glands]; basic structural unit; British standard unit |