NB

NB, Nb, or nb may refer to:

Arts and entertainment[edit]

Nota bene, often abbreviated as NB or n.b., a Latin phrase meaning "note well"
nb, ISO 639-1 code for Bokmål, the written standard of the Norwegian language
牛屄 (niúbī), a common word in Mandarin Chinese profanity

Niobium, symbol Nb, a chemical element
NB class, Australian steam locomotives
Boeing NB, a 1923 training aircraft
Naive Bayes classifier, in statistics
Neuroblastoma, a type of cancer
Nominal bore or nominal pipe size, a set of standard sizes for pipes
Nanobarn (nb), a unit of cross-sectional area
Mazda MX-5 (NB), the second generation of the Mazda MX-5
NB (programming language), an intermediate-stage language known as "New B" that evolved from the "B" language and then further evolved into the "C" language

Narrowboat ship prefix
National Battlefield, a protected area in the United States
No-ball in cricket
Non-binary, a term used by people who identify as neither male nor female.
NB, an abbreviation for North Britain used in addresses in Scotland in the nineteenth century e.g " 'The Sporran' Fifeshire, NB" (Used in The Importance of being Earnest" by Oscar Wilde.