NNO may stand for:
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Nuveen North Carolina Dividend Advantage Municipal Fund 2 (stock symbol: NNO)
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Natural number object In category theory, a natural numbers object (NNO) is an object endowed with a recursive structure similar to natural numbers. More precisely, in a category E with a terminal object 1, an NNO ''N'' is given by:
# a global element ''z'' : 1 → ''N ...
, in
category theory
Category theory is a general theory of mathematical structures and their relations that was introduced by Samuel Eilenberg and Saunders Mac Lane in the middle of the 20th century in their foundational work on algebraic topology. Nowadays, cate ...
, a subfield of mathematics
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National Night Out
National Night Out is a community-police awareness-raising event in the United States, held the first Tuesday of August (Texas celebrates on the first Tuesday in October).
History
The event has been held annually since 1984, and is sponsored by th ...
, a crime prevention activity in the United States
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Nynorsk
Nynorsk () () is one of the two written standards of the Norwegian language, the other being Bokmål. From 12 May 1885, it became the state-sanctioned version of Ivar Aasen's standard Norwegian language ( no, Landsmål) parallel to the Dano-No ...
, ISO 639-2 and ISO 639-3 language codes
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Nitrous oxide
Nitrous oxide (dinitrogen oxide or dinitrogen monoxide), commonly known as laughing gas, nitrous, or nos, is a chemical compound, an oxide of nitrogen with the formula . At room temperature, it is a colourless non-flammable gas, and has a ...
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