NPN may refer to:

Science and technology

Next Protocol Negotiation Application-Layer Protocol Negotiation (ALPN) is a Transport Layer Security (TLS) extension that allows the application layer to negotiate which protocol should be performed over a secure connection in a manner that avoids additional round trips ...

, in computer networking *

Non-protein nitrogen Nitrogen's effects on agriculture profoundly influence crop growth, soil fertility, and overall agricultural productivity, while also exerting significant impacts on the environment. Nitrogen is an element vital to many environmental processes. N ...

, an animal feed component *

NPN transistor A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor (FET), uses only one kind of charge carrier. A ...

Normal Polish notation Polish notation (PN), also known as normal Polish notation (NPN), Łukasiewicz notation, Warsaw notation, Polish prefix notation, Eastern Notation or simply prefix notation, is a mathematical notation in which operators ''precede'' their opera ...

, in mathematics

Organisations

National Party of Nigeria The National Party of Nigeria (NPN) was the dominant political party in Nigeria during the Second Republic (1979–1983). History Formation The party's beginning could be traced to private and sometimes secret meetings among key Northern Nigeri ...

, a former political party *

New Politics Network The New Politics Network (NPN) was an independent political and campaigning think tank in the United Kingdom, concerned with democratic renewal and popular participation in politics. It was founded as the successor to Democratic Left in 1999, and ...

, a UK think tank

Other uses

* Natural Health Product Number, required by the Canadian

Natural Health Products Directorate The Natural Health Products Directorate (NHPD) is the division of the Health Products and Food Branch of Health Canada that is responsible for implementation of the Natural Health Product Regulations, including Good Manufacturing Practices, for Nat ...

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