B (disambiguation)

B is the second letter of the alphabet.

B may also refer to:

In science and technology
*B battery, a battery used to provide the plate voltage of a vacuum tube
*Haplogroup B (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
*Haplogroup B (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
*B, Blood type
*B, abbreviation for astronomical objects in the Barnard list of dark nebulae
*Boron, a chemical element
*B, B+ and B-, expressions of buoyancy in Convective available potential energy
*B, Magnetic Field, in Physics
*B, "Brassavola", a genus of 20 orchids
*Bulb (photography), a shutter-speed setting
* b represents latitude in the Galactic coordinate system

In music, education and religion
*B (musical note)
* B, grade (education) for evaluation of students' work
*Codex Vaticanus, an ancient bible
*music|flat Flat (music), a note lower in pitch by a semitone
*

In computing and internet
*B (programming language)
*B-Method, for computer software development
*/b/, the random images board of CHAN message board sites
*b, bit
*B, byte

In publishing
*b (newspaper), a free daily, tabolid sized newspaper, published by the The Baltimore Sun

In sport,
*B, Blood type
* Backline, in Australian Rules football

ee also

*Decibel, one tenth of a bel (B)

fr:B
id:B
ku:B
nl:B
sq:B
uk:B