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B (disambiguation)

B is the second letter of the alphabet.

B may also refer to:

In science and technology

• B battery (vacuum tubes)
• Haplogroup B (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
• Haplogroup B (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
• B, Blood type
• 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
• ♭ 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

See also

• Decibel, one tenth of a bel (B)