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Twin prime
Twin primes, or prime pairs, are pairs of primes differing by exactly 2, like (3, 5) and (5, 7); whether infinitely many exist is an open conjecture.
Twin prime conjecture
The twin prime conjecture states that there are infinitely many primes p such that p + 2 is also prime, as in (3, 5) and (11, 13). It remains unproven.
Twin prime constant
The twin prime constant C₂ is a mathematical constant equal to about 0.66016, which measures how often pairs of primes two apart are expected to occur.
Twin primes
Twin primes are pairs of prime numbers separated by exactly 2, like (3, 5) and (11, 13); whether infinitely many exist is a famous open problem.
Twin Ring Motegi
Twin Ring Motegi (ツインリンクもてぎ), now Mobility Resort Motegi, is Honda's 1997 motorsport complex in Tochigi, Japan, with a 2.4 km oval and 4.8 km road course hosting the MotoGP Japanese Grand Prix.
Twin Rivers
Twin Rivers, also Twin Rivers Kopje, is a Middle and Later Stone Age archaeological site 24 km southwest of Lusaka, Zambia, with one of Africa's largest early pigment assemblages.
Twin sisters of Cain and Abel
The twin sisters of Cain and Abel are daughters of Adam and Eve whom extra-biblical Jewish and Islamic traditions portray as the brothers' wives, since Genesis names no women of their generation.
Twin Star Exorcists (双星の陰陽師)
Twin Star Exorcists (双星の陰陽師, Sōsei no Onmyōji) is Yoshiaki Sukeno's battle fantasy manga serialized in Jump SQ. from December 2013 to October 2024, 35 volumes, about exorcists Rokuro and Benio; TV anime 2016–2017.
Twin study
Twin study: a design comparing monozygotic (MZ, identical) and dizygotic (DZ, fraternal) twins to estimate genetic versus environmental contributions to traits, using ACE models; also known as the classical twin design. Distinguished by the equal environments assumption and the missing heritability gap with genomic estimates.
Twin Towers 2
Twin Towers II was a 2004 proposal by Kenneth Gardner and Herbert Belton to rebuild the World Trade Center towers, backed by Donald Trump but never built.
Twin Towers Correctional Facility
Twin Towers Correctional Facility (TTCF) is the Los Angeles County Sheriff's high-rise jail at 450 Bauchet St., downtown Los Angeles, opened 1997, housing maximum-security inmates and serving as the county jail system's main mental health facility.
Twin Town (1997 film)
Twin Town (1997) is Kevin Allen's Welsh black comedy crime film set in Swansea, starring Rhys Ifans and Llŷr Ifans as vengeful brothers; Danny Boyle executive produced, and it became a cult Welsh film.
Twin Tribes
Twin Tribes is an American darkwave duo formed in Brownsville, Texas, in 2017 by Luis Navarro and Joel Niño Jr., known for bilingual English and Spanish songs.
Twin Turbo (ツインターボ) (horse)
Twin Turbo (ツインターボ), Japanese Thoroughbred racehorse, bay colt foaled April 13, 1988, by Lyra Ridge out of Racing Jean; 35 starts, 6 wins, three G3 wins (Radio Tampa Sho, Tanabata Sho, All Comers), last of 13 in the 1994 Arima Kinen.
Twin-boom aircraft
A twin-boom aircraft carries its horizontal tail on two slender booms extending aft from the wing or fuselage, leaving space free for a pusher propeller, rocket exhaust, or cargo loading.
Twin-disc rolling contact rig
A twin-disc rolling contact rig, or twin-disc tribometer, is a laboratory machine that presses two rotating discs together to measure friction, wear, and rolling contact fatigue.
Twin-field quantum key distribution
Twin-field quantum key distribution (TF-QKD) is a quantum key distribution protocol in which two users send phase-randomized weak optical pulses meeting at an untrusted central station.
Twin-lens reflex camera
A twin-lens reflex camera is a film camera with two stacked lenses, the upper one showing a waist-level focusing image; the Rolleiflex was its best-known example.
Twin-reversed arterial perfusion sequence
Twin-reversed arterial perfusion (TRAP) sequence, also called acardiac twinning, is a rare monochorionic twin complication in which a pump twin perfuses a heartless acardiac twin through reversed umbilical artery flow, risking pump twin heart failure; treated by fetal ablation.
Twin-screw extruder
A twin-screw extruder is a continuous processing machine in which two parallel screws rotate in a shared barrel, conveying, melting, and mixing material toward a die.
Twin-screw extrusion
Twin-screw extrusion is a continuous processing method in which two screws rotating in a shared barrel melt, mix, and pressurize materials such as polymers, foodstuffs, and pharmaceuticals before extrusion through a die.
Twin-tip ski
Twin-tip ski: an alpine ski with an upturned tail mirroring the tip, enabling switch (backward) skiing. Developed with Mike Douglas into the Salomon TenEighty (1997); basis of freestyle, park, halfpipe, and slopestyle skiing.
Twin-to-twin transfusion syndrome
Twin-to-twin transfusion syndrome (TTTS), also called fetofetal transfusion syndrome, is a monochorionic twin pregnancy complication from unbalanced placental anastomoses, affecting about 15% of such pregnancies, staged by Quintero, and treated mainly with fetoscopic laser surgery.
Twin-turbo
A twin-turbo, also called bi-turbo or twin-turbocharged, is an internal combustion engine with two turbochargers, arranged in parallel, sequential, or two-stage series layouts to improve response and boost pressure.
Twinco Capital
Twinco Capital is a Dutch-Spanish supply chain finance fintech founded in 2016 by Sandra Nolasco and Carmen Marín, financing suppliers before goods are manufactured or invoiced.
Twine
Twine is a light cordage of twisted or wound yarns, thinner than cord and rope (Cordage Institute: under 0.200 in / 5 mm), made from jute, sisal, cotton, or synthetics, used for nets, binding, and tying, with Paleolithic origins.
Twinfilin
Twinfilin (TWF1) is a conserved ADF-H family actin-binding protein with twin ADF-H domains; it sequesters ADP-G-actin, caps or depolymerizes filament barbed ends, and uncaps capping protein.
Twining Oil and Gas Field
Twining Oil and Gas Field is an operating oil and gas field in south-central Alberta, Canada, discovered in 1951 and producing from Mississippian carbonate pools.
Twinings
Twinings (Twinings of London), British tea brand founded by Thomas Twining in 1706 at Tom's Coffee House on the Strand; owned by Associated British Foods since 1964, based in Andover, known for Earl Grey, Lady Grey, English Breakfast, and royal warrants since 1837.
Twinjet
A twinjet, also written twin jet, is a jet aircraft with two engines, now the dominant design for both single-aisle and wide-body airliners under ETOPS rules.