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, or edges meet.
 * Node (autonomous system), behaviour for an ordinary differential equation near a critical point
 * Singular point of an algebraic variety, a type of singular point of a curve

Spherical geometry

 * node, the points where a great circle crosses a plane of reference, or the equator of a sphare

Astronomy

 * Orbital node, the points where an orbit crosses a plane of reference
 * Lunar node, where the orbits of the Sun and Moon intersect
 * Longitude of the ascending node, how orbital nodes are parameterized

Biology

 * Lymph node, 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 or primitive node, the organizer tissue for gastrulation in vertebrates
 * The place on a plant stem where a leaf is attached
 * In cladistics, a shared ancestor (also see Clade)

Computing and electronics

 * Node (networking), a point of connection in a communication network
 * An entity in a mesh network
 * 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), a node in a graph that meets defined criteria for success or termination
 * Node (UML), the representation of a computational device in the Unified Modeling Language
 * Node.js, a JavaScript-based, cross-platform runtime environment
 * NodeB, hardware that is connected to the mobile phone network
 * NODE (wireless sensor), a wireless handheld sensor for smart devices
 * Node, a shorthand used to designate a semiconductor fabrication process

Linguistics

 * Node (linguistics), 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) or Node 2, module of the International Space Station
 * Tranquility (ISS module) or Node 3, a module of the International Space Station with the Cupola
 * Node 4, 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), 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 tribe, a community of pastoral nomads in India and Pakistan
 * Node, a transport hub in a transportation system
 * Giordana Racing Team, a British cycling team, formerly named Node4-Giordana
 * Node Magazine, a literary project based on the novel Spook Country by William Gibson
 * New Oxford Dictionary of English, a single-volume English language dictionary, see Oxford Dictionary of English
 * Node, a cyborg with a donated human face used as a guide, in "Silence in the Library" (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