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Submarine Telegraph Company
The Submarine Telegraph Company was a British company founded in 1851 by Jacob Brett and John Watkins Brett to lay the first commercially successful submarine telegraph cable, between Dover and Calais.
Submarine Warfare insignia
Submarine Warfare insignia, or "dolphins," the U.S. Navy breast pin for personnel qualified in submarines; proposed by Captain Ernest J. King in 1923, approved March 1924, gold for officers and silver for enlisted.
Submarine-launched ballistic missile
A submarine-launched ballistic missile (SLBM) is a long-range nuclear missile fired from a ballistic missile submarine, first deployed by the United States with Polaris in 1960.
Submarine-launched cruise missile
A submarine-launched cruise missile (SLCM) is a cruise missile launched from a submarine, submerged or surfaced. Principal examples are the US Tomahawk and the Russian Kalibr.
Submarines in the United States Navy
The US Navy's submarines, also called the US Submarine Force, are nuclear-powered vessels in four classes totaling about 67 boats, performing attack, strike, and nuclear deterrence missions.
Submer
Submer is a Barcelona-based technology company founded in 2015 by Daniel Pope and Pol Valls that builds single-phase immersion cooling systems for data centers, and has since expanded into data center development and AI infrastructure.
Submerged arc furnace
A submerged arc furnace (SAF), also called an arc-resistance furnace, is an electric furnace with carbon electrodes buried in the charge, the predominant unit for producing ferroalloys like ferrochrome.
Submerged arc welding
Submerged arc welding (SAW) is a high-current arc welding process in which the arc and weld pool are buried under granular flux, used for thick plates in shipbuilding and pipelines.
Submerged combustion vaporizer
A submerged combustion vaporizer (SCV) is a fired heat exchanger that regasifies liquefied natural gas by burning fuel gas in a burner immersed in a water bath.
Submerged fermentation
Submerged fermentation is a cultivation method in which microorganisms grow suspended in aerated liquid medium, the backbone of industrial biotechnology and over 75% of industrial enzyme production.
Submergence (film)
Submergence (2017), Wim Wenders romantic thriller adapted by Erin Dignam from J.M. Ledgard's novel, starring James McAvoy and Alicia Vikander; premiered at TIFF, US release April 2018, 22% on Rotten Tomatoes.
Submersible
A submersible, or submersible craft, is a self-propelled underwater craft that carries personnel while operating below the surface and surfacing under its own buoyancy control.
Submersible pump
A submersible pump, also called an electric submersible pump, is a pump with a sealed motor that operates fully submerged in the liquid it moves.
Submesoscale ocean process
A submesoscale ocean process is an ocean current or circulation feature between mesoscale eddies and small-scale turbulence, with horizontal scales of roughly 1 to 10 km and time scales of hours to days.
Submillimeter Array
The Submillimeter Array (SMA) is an eight-antenna radio interferometer near the summit of Maunakea in Hawaiʻi that observes at submillimeter wavelengths and joined the Event Horizon Telescope's first black hole images.
Submillimeter galaxy
A submillimeter galaxy (SMG) is a very luminous, dust-obscured star-forming galaxy detected at submillimeter wavelengths, typically found at high redshift and contributing strongly to cosmic star formation.
Submillimeter Wave Astronomy Satellite
The Submillimeter Wave Astronomy Satellite, or SWAS, was a NASA Small Explorer space telescope launched in 1998 to measure water vapor and molecular oxygen in interstellar clouds.
Submission (TV series)
Submission is a 2016 American Showtime erotic drama mini-series, six episodes, created by Paul Fishbein and Jacky St. James, starring Ashlynn Yennie, Justin Berti, and Raylin Joy; aired May 12 to June 16, 2016, TV-MA, IMDb 5.3.
Submission wrestling
Submission wrestling, also called submission grappling or no-gi, is a clinch-and-ground combat sport format aiming to force a tap-out via submission holds, drawing on catch wrestling, luta livre, BJJ, judo, and sambo; its flagship event is the ADCC World Championship, founded 1998.
Submissiveness
Submissiveness (ICD-11 MB28.H): a behavioral tendency to adapt one's actions to others' real or perceived wishes against one's own interests; studied as a trait linked to social anxiety, depression, and distress intolerance.
Submodular set function
A submodular set function assigns real numbers to subsets of a finite set with diminishing returns; its Lovász extension is convex, and it can be minimized in strongly polynomial time.
Submotion Orchestra
Submotion Orchestra is a British seven-piece live electronic band from Leeds, formed in 2009, blending dubstep-influenced bass music, jazz, soul, and dub around vocalist Ruby Wood.
Submucosa
Submucosa: the layer of loose connective tissue beneath the mucosa of the digestive, respiratory, urinary, and genital tracts, carrying vessels, lymphatics, nerves, Meissner's plexus, and regional glands such as Brunner glands.
Submucosal cleft palate
Submucosal cleft palate (SMCP, ORPHA:155878) is a congenital cleft palate variant with midline soft palate muscle diastasis under intact mucosa, diagnosed by Calnan's triad of bifid uvula, zona pellucida, and hard palate notch; occult forms lack the triad.
Subnautica
Subnautica is an open world underwater survival game by Unknown Worlds set on planet 4546B; early access 2014, full release January 2018, over 5 million sold, followed by Below Zero and Subnautica 2.
Subnautica 2
Subnautica 2 is an underwater survival adventure by Unknown Worlds, the sequel to Subnautica, set on a new alien ocean world with 4-player co-op. It entered Early Access May 14, 2026 ($29.99) after a Krafton dispute and Delaware ruling reinstating CEO Ted Gill.
Subnautica: Below Zero
Subnautica: Below Zero is Unknown Worlds' arctic survival sequel set on planet 4546B, starring scientist Robin Ayou; early access January 30, 2019, full release May 14, 2021, over 2.8 million copies sold.
Subnet
A subnet, or subnetwork, is a sub-section of a single IP network, defined by a subnet mask or CIDR prefix and used to segment networks in data centers and cloud platforms.
Subnitride
A subnitride is a metal-rich, nitrogen-poor nitride in which nitrogen occupies interstitial sites of a bonded metal sublattice, including electrides such as Ca2N where excess electrons act as anions.
Subobject classifier
A subobject classifier is an object Ω in a category that classifies subobjects via pullbacks, generalizing characteristic functions of subsets; it is a defining axiom of a topos.