Question: What is a ray in geometry?

Ray


Ray may refer to:

Science and mathematics
Ray (geometry), half of a line proceeding from an initial point
Ray (graph theory), an infinite sequence of vertices such that each vertex appears at most once in the sequence and each two consecutive vertices in the sequence are the two endpoints of an edge in the graph
Ray (optics), an idealized narrow beam of light
Ray (quantum theory), an equivalence class of state-vectors representing the same state
Biology
Ray (fish), a superorder of cartilaginous fishes
Ray (fish fin anatomy), a bony or horny spine in the fin of a fish
Arts and entertainment
Music
The Rays, an American musical group active in the 1950s
Ray (musician), stage name of Japanese singer Reika Nakayama (born 1990)
Ray J, stage name of singer William Ray Norwood, Jr. (born 1981)
Ray (Frazier Chorus album)
Ray (L'Arc-en-Ciel album)
Rays (Michael Nesmith album)
Ray (soundtrack), a soundtrack of the film Ray
Ray (EP), an album by Panic Channel
"Ray" (song), a song by Millencolin
Ray or re, the second scale degree in solfege
Fictional characters
Ray Barone, main character in the American sitcom Everybody Loves Raymond
Ray Donovan, titular main character in the American TV drama series Ray Donovan
Father Ray Mukada, priest character in the American TV drama series Oz
Ray Stantz, a main character in the American film Ghostbusters
Ray, a protagonist in Ray the Animation, a science fiction anime television series
Ray, a main character in the Canadian television series Rusty Rivets
Ray the Flying Squirrel, a video game character from Sonic the Hedgehog
Ray (comics), a DC Comics character
Other
Ray (art journal), a British little magazine
Ray (manga), a manga about a female doctor with X-ray vision
Ray (film), a 2004 film biography of singer Ray Charles
People
Ray (surname)
Ray (given name)
Places
Iran
Ray, Iran, a city in the Greater Tehran metropolis
Rey County, Tehran Province
Ray, South Khorasan, a small village
United States
Ray, Alabama
Ray, Arizona
Ray, Indiana and Michigan, Steuben and Branch counties
Ray Township, Michigan, Macomb County
Ray, Minnesota
Ray County, Missouri
Ray, North Dakota
Other countries
Ray, a Cambodian village in Ke Chong
Mount Ray (British Columbia), a Canadian volcano
Ray, Templeport, a townland in County Cavan, Ireland
River Ray,  Buckinghamshire and Oxfordshire, England, UK
River Ray, Wiltshire, England, UK
Sport
Tampa Bay Rays, a Major League Baseball team
Ray (wrestler), Hong Kong professional wrestler
Transport
Rays Engineering, a Japanese automotive wheel manufacturer
Kia Ray, a prototype or concept car
USS Ray, a U.S. Navy vessel
Other uses
Rays (retailer), an Australian outdoor equipment and clothing retailer formerly known as Ray's Outdoors
Rays Linux or Sunwah Linux
Raha-automaattiyhdistys, a Finnish gambling service provider
Arabic letter rāʾ ر
Sony Ericsson Xperia ray
See also
Rhea (disambiguation)
Medullary ray (anatomy), the middle part of the Cortical lobule
Medullary ray (botany), characteristic radial sheets or ribbons extending vertically, found in woods
Radius (disambiguation)
Radiation (disambiguation)
Beam (disambiguation)
Rye (disambiguation)
Justice Ray (disambiguation)