In general, a node is a localized swelling (a "

knot A knot is an intentional complication in cordage which may be practical or decorative, or both. Practical knots are classified by function, including hitches, bends, loop knots, and splices: a ''hitch'' fastens a rope to another object; a ' ...

") or a point of intersection (a

vertex Vertex, vertices or vertexes may refer to: Science and technology Mathematics and computer science *Vertex (geometry), a point where two or more curves, lines, or edges meet *Vertex (computer graphics), a data structure that describes the position ...

). Node may refer to:

In mathematics

Vertex (graph theory) In discrete mathematics, and more specifically in graph theory, a vertex (plural vertices) or node is the fundamental unit of which graphs are formed: an undirected graph consists of a set of vertices and a set of edges (unordered pairs of ve ...

, a vertex in a mathematical graph *

Vertex (geometry) In geometry, a vertex (in plural form: vertices or vertexes) is a point (geometry), point where two or more curves, line (geometry), lines, or edge (geometry), edges meet. As a consequence of this definition, the point where two lines meet to for ...

, a point where two or more curves, lines, or edges meet. *

Node (autonomous system) The behaviour of a linear autonomous system around a critical point is a node if the following conditions are satisfied: Each path converges to the or away from the critical point (dependent of the underlying equation) as t \rightarrow \infty (o ...

, behaviour for an ordinary differential equation near a critical point * Singular point of an algebraic variety, a type of singular point of a curve

In science and engineering

Astronomy

* Orbital node, the points where an orbit crosses a plane of reference **

Lunar node A lunar node is either of the two orbital nodes of the Moon, that is, the two points at which the orbit of the Moon intersects the ecliptic. The ''ascending'' (or ''north'') node is where the Moon moves into the northern ecliptic hemisphere, w ...

, where the orbits of the sun and moon intersect **

Longitude of the ascending node The longitude of the ascending node (☊ or Ω) is one of the orbital elements used to specify the orbit of an object in space. It is the angle from a specified reference direction, called the ''origin of longitude'', to the direction of the asce ...

, how orbital nodes are parameterized

Biology

Lymph node A lymph node, or lymph gland, is a kidney-shaped organ of the lymphatic system and the adaptive immune system. A large number of lymph nodes are linked throughout the body by the lymphatic vessels. They are major sites of lymphocytes that inclu ...

, an immune system organ used to store white blood cells * Node of Ranvier, periodic gaps in the insulating myelin sheaths of myelinated axons * Sinoatrial node and atrioventricular node, specialized tissues in the heart responsible for initiating and coordinating the heartbeat *

Primitive knot The primitive node (or primitive knot) is the organizer for gastrulation in most amniote embryos. In birds it is known as Hensen's node, and in amphibians it is known as the Spemann-Mangold organizer. It is induced by the Nieuwkoop center in am ...

or primitive node, the organizer tissue for gastrulation in vertebrates *The place on a

plant stem A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports water and dissolved substances between the roots and the shoots in the xylem and phloem, stores nutrien ...

where a leaf is attached *In

Cladistics Cladistics (; ) is an approach to biological classification in which organisms are categorized in groups (" clades") based on hypotheses of most recent common ancestry. The evidence for hypothesized relationships is typically shared derived char ...

, a shared ancestor (also see

Clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

)

Computing and electronics

Node (networking) In telecommunications networks, a node (, ‘knot’) is either a redistribution point or a communication endpoint. The definition of a node depends on the network and protocol layer referred to. A physical network node is an electronic device ...

, a point of connection in a communication network *An entity in a

mesh network A mesh network is a local area network topology in which the infrastructure nodes (i.e. bridges, switches, and other infrastructure devices) connect directly, dynamically and non-hierarchically to as many other nodes as possible and cooperate wit ...

* Node (circuits), a region in an electrical circuit where there is no change in potential * Node (computer science), a basic unit used to build data structures *

Goal node (computer science) In computer science, a goal node is a node in a graph that meets defined criteria for success or termination. Heuristical artificial intelligence algorithms, like A* and B*, attempt to reach such nodes in optimal time by defining the distance ...

, a node in a graph that meets defined criteria for success or termination *

Node (UML) A node in the Unified Modeling Language (UML) is a computational resource upon which artifact (UML), UML artifacts may be deployed for execution. OMG (2008). OMG Unified Modeling Language (OMG UML), Superstructure, V2.1.2'' p.199-210. There are ...

, the representation of a computational device in the Unified Modeling Language *

Node.js Node.js is an open-source server environment. Node.js is cross-platform and runs on Windows, Linux, Unix, and macOS. Node.js is a back-end JavaScript runtime environment. Node.js runs on the V8 JavaScript Engine and executes JavaScript code ou ...

, a JavaScript-based, cross-platform runtime environment *

NodeB {{Unreferenced, date=May 2019, bot=noref (GreenC bot) Node B is the telecommunications node in particular mobile communication networks, namely those that adhere to the UMTS standard. The Node B provides the connection between mobile phones ( UEs) ...

, hardware that is connected to the mobile phone network *

NODE (wireless sensor) NODE+ (wireless sensor platform) is a first-generation handheld sensor measuring 1 inch in diameter and 3.75 inches wide that communicates wirelessly through low-energy Bluetooth 4.0 with Apple iOS devices. NODE+ has been attributed in the media ...

, a wireless handheld sensor for smart devices *Node, a shorthand used to designate a

semiconductor fabrication process Semiconductor device fabrication is the process used to manufacture semiconductor devices, typically integrated circuit (IC) chips such as modern computer processors, microcontrollers, and memory chips such as NAND flash and DRAM that are pr ...

Linguistics

Node (linguistics) In formal syntax, a node is a point in a tree diagram or syntactic tree that can be assigned a syntactic category label. Nodes under phrase structure rules Before the emergence of the X-bar theory, thus in the period between Chomsky (1957) a ...

, a branch point in the Tree model, or Node Theory, of language evolution

Physics

* Node (physics), a point along a standing wave where the wave has minimal amplitude

Space-station modules

* Unity (ISS module) or Node 1, one of the first modules of the International Space Station *

Harmony (ISS module) ''Harmony'', also known as ''Node 2'', is the "utility hub" of the International Space Station. It connects the laboratory modules of the United States, Europe and Japan, as well as providing electrical power and electronic data. Sleeping cabi ...

or Node 2, module of the International Space Station *

Tranquility (ISS module) ''Tranquility'', also known as Node 3, is a module of the International Space Station (ISS). It contains environmental control systems, life support systems, a toilet, exercise equipment, and an observation cupola. The European Space Agency ( ...

or Node 3, a module of the International Space Station with the Cupola *

Node 4 Node 4, also known as the Docking Hub System (DHS), was a proposed module of the International Space Station (ISS). In 2011 NASA was considering a 40-month design and development effort for Node 4 that would result in its launch in late 2013. No ...

, a proposed module of the International Space Station * '' Prichal (ISS module)'', a planned module of the International Space Station to be launched in 2021

In music

Node (band) Node is an Italian death metal band formed in Milan in 1994 and currently signed to Punishment 18 Records. Their last (sixth) full-length studio album, ''Cowards Empire'' was released in 2016. Members *CN Sid (since 2012) *Gary D'Eramo – guitar ...

, Italian death metal band * Node (singer), Danish singer and hip hop artist of Kurdish origin * ''Node'' (album), a 2015 album by Australian metalcore band Northlane

Other uses

Node, Kentucky Node is an unincorporated community located in Metcalfe County, Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It bor ...

* Node tribe, a community of pastoral nomads in India and Pakistan *

Node In general, a node is a localized swelling (a "knot") or a point of intersection (a vertex). Node may refer to: In mathematics *Vertex (graph theory), a vertex in a mathematical graph *Vertex (geometry), a point where two or more curves, lines, ...

, a transport hub in a transportation system * Giordana Racing Team, a British cycling team, formerly named Node4-Giordana *''

Node Magazine ''Node Magazine'' is a literature, literary project in the guise of a fictional magazine created to annotate the novel ''Spook Country'' by William Gibson. The project is essentially a hypertext version of the novel. It takes its name from ''Node ...

'', a literary project based on the novel ''

Spook Country ''Spook Country'' is a 2007 novel by speculative fiction author William Gibson. A political thriller set in contemporary North America, it followed on from the author's previous novel, ''Pattern Recognition'' (2003), and was succeeded in 2010 by ...

'' by

William Gibson William Ford Gibson (born March 17, 1948) is an American-Canadian speculative fiction writer and essayist widely credited with pioneering the science fiction subgenre known as ''cyberpunk''. Beginning his writing career in the late 1970s, his ...

*''New Oxford Dictionary of English'', a single-volume English language dictionary, see

Oxford Dictionary of English The ''Oxford Dictionary of English'' (''ODE'') is a single-volume English dictionary published by Oxford University Press, first published in 1998 as ''The New Oxford Dictionary of English'' (''NODE''). The word "new" was dropped from the titl ...

*Node, a cyborg with a donated human face used as a guide, in "

Silence in the Library "Silence in the Library" is the eighth episode of the fourth series of the revived British science fiction television series ''Doctor Who''. It was first broadcast on BBC One on 31 May 2008. It is the first of a two-part story; the second part, ...

" (''Doctor Who'') *Node, the pommel-like part of a chalice where the stem meets the cup *A nodal organizational structure, such as in terms of business management, see

Cellular organizational structure A non-biological entity with a cellular organizational structure (also known as a cellular organization, cellular system, nodal organization, nodal structure, et cetera) is set up in such a way that it mimics how natural systems within biology ...