NP may refer to:

Arts and entertainment

* ''NP'' (novel), by Japanese author Banana Yoshimoto

Organizations

* Nashua-Plainfield Community School District, Iowa, United States *

National Party (disambiguation) National Party or Nationalist Party may refer to: Active parties * National Party of Australia, commonly known as ''The Nationals'' * Bangladesh: ** Bangladesh Nationalist Party ** Jatiya Party (Ershad) a.k.a. ''National Party (Ershad)'' * Cali ...

, various political parties * Ngee Ann Polytechnic, Singapore *

Nigeria Police Force The Nigeria Police Force is the principal law enforcement and the lead security agency in Nigeria. It was designated by the 1999 constitution as the national police of Nigeria, with exclusive jurisdiction throughout the country. As at 2021, i ...

Northern Pacific Railway The Northern Pacific Railway was an important American transcontinental railroad that operated across the northern tier of the Western United States, from Minnesota to the Pacific Northwest between 1864 and 1970. It was approved and chartered b ...

(AAR reporting mark NP) * November Project, free, open-to-the-public exercise group

Places

* NP postcode area, Newport, Wales, UK *

Nepal Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia. It is mainly situated in the Himalayas, but also includes parts of the Indo-Gangetic Plain. It borders the Tibet Autonomous Region of China Ch ...

(ISO 3166-1 alpha-2 country code NP) ** .np, the country code top level domain (ccTLD) for Nepal

Science, technology and mathematics

Biology and medicine

* Nucleoside phosphorylase, an enzyme *

Nurse practitioner A nurse practitioner (NP) is an advanced practice registered nurse and a type of mid-level practitioner. NPs are trained to assess patient needs, order and interpret diagnostic and laboratory tests, diagnose disease, prescribe medications an ...

* Kallikrein 8, an enzyme *

Neptunium Neptunium is a chemical element; it has chemical symbol, symbol Np and atomic number 93. A radioactivity, radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar Syste ...

, symbol Np, a chemical element * Nosocomial pneumonia * Natriuretic peptide

Mathematics and computer science

NP (complexity) In computational complexity theory, NP (nondeterministic polynomial time) is a complexity class used to classify decision problems. NP is the Set (mathematics), set of decision problems for which the Computational complexity theory#Problem ins ...

, Nondeterministic Polynomial, a computational complexity class **

NP-complete In computational complexity theory, NP-complete problems are the hardest of the problems to which ''solutions'' can be verified ''quickly''. Somewhat more precisely, a problem is NP-complete when: # It is a decision problem, meaning that for any ...

, a class of decision problems **

NP-hard In computational complexity theory, a computational problem ''H'' is called NP-hard if, for every problem ''L'' which can be solved in non-deterministic polynomial-time, there is a polynomial-time reduction from ''L'' to ''H''. That is, assumi ...

, a class of problems in computational complexity **

Co-NP In computational complexity theory, co-NP is a complexity class. A decision problem X is a member of co-NP if and only if its complement is in the complexity class NP. The class can be defined as follows: a decision problem is in co-NP if and o ...

, a complexity class *

Numpy NumPy (pronounced ) is a library for the Python programming language, adding support for large, multi-dimensional arrays and matrices, along with a large collection of high-level mathematical functions to operate on these arrays. The predeces ...

a Python mathematical library * Named Pipe a method for Inter-Process Communications (IPC)

Physics and chemistry

* NP junction or PN junction in a semiconductor device *

Neopentane Neopentane, also called 2,2-dimethylpropane, is a double-branched-chain alkane with five carbon atoms. Neopentane is a flammable gas at room temperature and pressure which can condense into a highly volatile liquid on a cold day, in an ice bat ...

, the simplest double-branched-chain alkane *

Neper The neper (symbol: Np) is a logarithmic unit for ratios of measurements of physical field and power quantities, such as gain and loss of electronic signals. The unit's name is derived from the name of John Napier, the inventor of logarithms. ...

(Np), a logarithmic unit for ratios *

, a chemical element with symbol Np *

Power number : For Newton number, see also Kissing number in the sphere packing problem. The power number ''N''p (also known as Newton number) is a commonly used dimensionless number relating the resistance force to the inertia force. The power-number ha ...

(N_p), relating resistance force to inertia force *

Phosphorus nitride Phosphorus nitride refers to several chemical compounds of phosphorus and nitrogen Nitrogen is a chemical element; it has Symbol (chemistry), symbol N and atomic number 7. Nitrogen is a Nonmetal (chemistry), nonmetal and the lightest member of ...

Other uses in science and technology

* New Proposal, in the

International Organization for Standardization The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. M ...

(ISO) standardization process *

Not placed A bill of materials or product structure (sometimes bill of material, BOM or associated list) is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities of each needed to manufacture an end ...

, a term used in printed circuit board design to denote the omitting of a component *

Nanoparticle A nanoparticle or ultrafine particle is a particle of matter 1 to 100 nanometres (nm) in diameter. The term is sometimes used for larger particles, up to 500 nm, or fibers and tubes that are less than 100 nm in only two directions. At ...

Noun phrase A noun phrase – or NP or nominal (phrase) – is a phrase that usually has a noun or pronoun as its head, and has the same grammatical functions as a noun. Noun phrases are very common cross-linguistically, and they may be the most frequently ...

, in grammar

Other uses

No problem ''No problem'' is an English expression, used as a response to '' thanks'' (among other functions). It is regarded by some as a less formal alternative to '' you're welcome'', which shares the same function. Informality In the culture of younger ...

Notary public A notary public ( notary or public notary; notaries public) of the common law is a public officer constituted by law to serve the public in non-contentious matters usually concerned with general financial transactions, estates, deeds, powers- ...

, post-nominal