Border guard, a state agent who controls the security at bordersHonor guard, a ceremonial escort
Places
Sentinel, CaliforniaSentinel, OklahomaSentinel Island (disambiguation)Sentinel Islands, a pair of islands in the Andaman IslandsSentinel Range, a mountain range in AntarcticaSentinel Peak (Alberta)Sentinel Peak (Antarctica)Sentinel Peak (Arizona)Sentinel Peak (British Columbia)The Sentinel (Montana), a mountain peak in Glacier National Park
Buildings
Sentinel Building (disambiguation), multipleSentinel (building), an apartment tower in North Shore City, New ZealandThe Sentinels, two residential block towers in Birmingham, UKSentinel Secondary School, a school in West Vancouver, British Columbia
Transportation
Sentinel (steamboat), a small wooden steamboat associated with the Puget Sound Mosquito Fleet
Publications
Christian Science Sentinel
Local newspapers
The Sentinel (Gauhati), published in Gauhati, Assam, IndiaThe Sentinel (Lewistown), published in Lewistown, PennsylvaniaThe Sentinel (Pennsylvania), published in Carlisle, PennsylvaniaThe Sentinel (Staffordshire), published in Stoke-on-Trent, EnglandThe Sentinel, published in St Helena Island, South Atlantic OceanThe Daily Sentinel (Colorado), based in Grand Junction, ColoradoThe Daily Sentinel (Texas), based in Nacogdoches, TexasThe Daily Sentinel, based in Pomeroy, OhioHolland Sentinel, published in Holland, MichiganLos Angeles Sentinel, published in Los Angeles, CaliforniaMilwaukee Journal Sentinel, published in Milwaukee, WisconsinThe News-Sentinel, published in Fort Wayne, IndianaOrlando Sentinel, published in Orlando, FloridaSan Francisco Sentinel, published in San Francisco, CaliforniaSanta Cruz Sentinel, published in Santa Cruz, CaliforniaSmoky Mountain Sentinel, published in Hayesville, North CarolinaSt. Louis Sentinel, published in St. Louis, MissouriSun-Sentinel, published in Fort Lauderdale, Florida and Broward CountyTwin City Sentinel, published in Winston Salem, North CarolinaThe Valley Sentinel, published in Valemount, British Columbia, Canada
Student publications
The Sentinel (KSU), published by Kennesaw State UniversityThe Sentinel, published by Melbourne High School
Lorries and locomotives
Sentinel Waggon Works, a British engineering firm that produced lorries and locomotives:
LMS Sentinels 7160-3LMS Sentinel 7164LMS Sentinel 7192S&DJR Sentinels
Military
Sentinel tank, an Australian-built World War II Cruiser TankMPQ-64 Sentinel, a radar used by the United States militaryRaytheon Sentinel, an aircraft used by the Royal Air Force and British ArmyRQ-170 Sentinel, USAF stealth drone officially acknowledged in early December 2009Sentinel class cutter, a Fast Response Cutter with the United States Coast Guard
Media and entertainment
Film and television
The Sentinel (1977 film), a 1977 film based on the Jeffrey Konvitz novelLa Sentinelle (film), a 1992 film by the French director Arnaud DesplechinThe Sentinel (2006 film), a thriller directed by Clark Johnson starring Michael DouglasThe Sentinel (TV series), a US television series that ran from 1996 to 1999"The Sentinel" (Stargate SG-1), a TV episodeSentinel (Beast Wars), a computer in the TV show Beast WarsA type of robot in the Matrix film series
Music
Sentinel (band)The Sentinel (album),an album by PallasSentinel (album), an album by Nigel Mazlyn Jones"Sentinel" (instrumental), by Mike OldfieldA song by VNV Nation on their album Of Faith, Power and GloryA song by Judas Priest on their album Defenders of the FaithA song by Alice Cooper on his album DragontownA song by Hilltop Hoods on their album The CallingA song by At The Throne of Judgment on their album The Arcanum OrderSentinel Sound, a reggae and dancehall sound system from Stuttgart, Germany
Literature
The Sentinel (anthology), a collection of short stories by Arthur C. Clarke"The Sentinel" (short story), a 1951 short story by Arthur C. ClarkeThe Sentinel (novel), a 1974 novel by Jeffrey KonvitzSentinels novels, a series of novels by Van Allen PlexicoGundam Sentinel, a 1987 serial "photo-novel"
Comics
Sentinel (comics), a group of mutant-hunting robots in the Marvel universeSentinel (comic book), a comic book seriesAlan Scott, the original Green Lantern, who used the alias "Sentinel" at one pointSentinel Prime, a fictional character in the Transformers universe, the original autobot leader before Optimus Prime
Gaming
The Sentinel (video game), a 1986 game created by Geoff CrammondThe Sentinel (module), an adventure module for Dungeons & DragonsA 1984 computer game created by Bryan BrandenburgA 2004 computer game published by DetalionA vehicle in the Warhammer 40,000 universeA Forerunner Guard robot in the "Halo" TrilogyOne of the two teams in Defense of the AncientsMoonlight Sentinel and Ghost Sentinel, two occupations available in the popular MMORPG Lineage 2A Paradigm role in Final Fantasy XIIIA highly promoted character class in Fire Emblem: Radiant DawnA police-based gang led by Axl in RoadKillA vehicle that appears in the Grand Theft Auto seriesA class in Mass Effect, specializing in tech and biotics.
Computing
Sentinel node, an object to represent the end of a data structureSentinel value, a value used to terminate a loopThe name of the nil that terminates a variable length list of parameters in Objective-CIn network protocols such as Bisync, sentinel values indicate where frames start and end
Other meanings
Animal sentinels, which give early indications to environmental hazardsSentinel (satellite), GMES Sentinel satellites, Series of ESA funded Earth Observation satellitesSentinel (sculpture), a sculpture by Tim TolkienSentinels (Hudson), a public artwork by American artist Jon Barlow HudsonSentinel (publisher), a book publisherSentinel lymph node, the first lymph node affected by a metastasising cancerSentinel (FBI), an FBI software project replacing the failed Virtual Case FileSentry (disambiguation)
