B7

B7 or B-7 may refer to:

• Vitamin B7, Biotin.
• The B7 gene, important in the immune system.
• The Douglas Y1B-7, a bomber of the United States Army Air Corps.
• HMS B7, a B-class submarine of the Royal Navy.
• B7, the IATA code for UNI Airways, Taiwan.
• B7, an international standard paper size (88×125 mm), defined in ISO 216.
• Blake's 7, a BBC science fiction television series first broadcast in 1978–1981.
• It is also slang on the GameFAQs message boards (especially LUE) for when someone has done something that will warrent their account banned from the boards. It is a play on the shift + 7 action that makes the ampersand. B + 7 = B+ & = B + And = Banned.