{{Wiktionary|node}} In general, a '''node''' is a localized swelling (a "knot") or a point of intersection (a vertex).
'''Node''' may refer to: {{TOC right}}
==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
==In science and engineering==
===Spherical geometry=== * node, the points where a great circle crosses a plane of reference, or the equator of a sphere
===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
== See also == *Nodal (disambiguation) *Nodule (disambiguation)