Arc

Arc may refer to:

Mathematics

Arc (geometry), a segment of a differentiable curve
Arc (projective geometry), a particular type of set of points of a projective plane
Arcminute, a measure used for angles, equal to 1/60th of a degree
"arc-", a prefix sometimes used for an inverse function, specifically trigonometry functions
A directed edge in graph theory

120° parhelion, relatively rare halo, an optical phenomenon occasionally appearing along with very bright sun dogs
Infralateral arc, a rare halo, an optical phenomenon appearing similar to a rainbow under a white parhelic circle
Lower tangent arc, rarely observable halo, an optical phenomenon appearing under and tangent to a 22° halo centred around the sun
Parry arc, a rare halo, an optical phenomenon which occasionally appears over a 22° halo together with an upper tangent arc
Subhelic arc, a rare halo that curves upwards from the horizon and touches the tricker arc above the anthelic point
Supralateral arc, a rare halo, an optical phenomenon often confused with the indeed infrequently appearing 46° halo
Upper tangent arc, halo, an atmospheric optical phenomenon which appears over and tangent to the 22° halo centred around the sun

Arc chute, a protective device in an electrical circuit breaker
Arc lamp, a device that produces light by an electric arc
Arc welding, a method of welding that uses an electric arc to melt the metals together
Electric arc or voltaic arc, an ongoing plasma discharge (an electric current through a gas), producing light and heat
Arc or arch, a bowed or curved structure capable of spanning a space while supporting significant weight

Arc (Savoie), a river of eastern France, tributary of the Isère river
Arc (Provence), a river of southern France, flowing into the Étang de Berre
Les Arcs, a ski resort in the French Alps
Volcanic arc, a chain of volcanoes positioned in an arc shape as seen from above
Island arc, a type of archipelago composed of a chain of volcanoes which alignment is arc-shaped, and which are situated parallel and close to a boundary between two converging tectonic plates

Arc (programming language), a Lisp dialect designed by Paul Graham
ARC (file format), a file extension for archive files
arc, the command-line interface for ArcInfo
Arc System Works, a video game developer
ARC International, a developer of configurable microprocessor technology now owned by Synopsys

Aramaic language (ISO 639-2/3 language code), a Semitic language
Arc @ UNSW, the principal student organisation at the University of New South Wales
Arc of the United States, a charitable organization
Joan of Arc (c. 1410–1431), nicknamed "The Maid of Orléans" (French: Jeanne d'Arc, IPA: [ʒan daʁk]; ca. 1412 – 30 May 1431), is considered a national heroine of France and a Catholic saint
Prix de l'Arc de Triomphe, a Group 1 flat horse race
Arc (Bahá'í), a number of administrative buildings for the Bahá'í Faith, located on Mount Carmel in Israel
Sony Ericsson Xperia Arc, a cellphone