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Triplet state
The triplet state, also called a spin triplet, is a quantum state with total electron spin S = 1, giving three spin orientations (MS = +1, 0, and −1).
Triplet superconductor
A triplet superconductor is a rare superconducting material in which Cooper pairs form from electrons with parallel spins, total spin 1, instead of the spin-singlet pairs of almost all known superconductors.
Triplet therapy
Triplet therapy is a cancer treatment using three drugs together, shown to extend survival in metastatic colorectal and pancreatic cancer at the cost of higher toxicity.
Triplet-state EPR
Triplet-state EPR is the electron paramagnetic resonance spectroscopy of excited triplet states, where two electron spins couple to S = 1 and are split by zero-field splitting.
Triplet–triplet annihilation upconversion
Triplet–triplet annihilation upconversion (TTA-UC), also called photochemical upconversion, is a photophysical process combining two low-energy photons into one of higher energy, and it works in ordinary sunlight.
Triplet–triplet annihilation upconversion for photovoltaics
Triplet–triplet annihilation upconversion for photovoltaics (TTA-UC) is a photochemical technique that converts two sub-bandgap photons into one higher-energy photon a solar cell can absorb, first demonstrated in 2012.
Triplet–triplet annihilation upconversion in photocatalysis
Triplet–triplet annihilation upconversion (TTA-UC) is a photophysical process that converts two low-energy photons into one higher-energy photon, letting photocatalysis run on light the catalyst cannot directly absorb.
Triplet–triplet energy transfer
Triplet–triplet energy transfer (TTET, also triplet energy transfer) is a photophysical process in which an excited triplet donor molecule passes energy to an acceptor, leaving the acceptor in its triplet state.
Triplex locomotive
The Triplex locomotive was an articulated compound steam locomotive with three sets of driving wheels, the third placed under the tender, built by Baldwin to George R. Henderson's design.
Triplochiton
Triplochiton K.Schum. is a genus of two African timber trees in Malvaceae (Helicteroideae), including T. scleroxylon, the obeche or ayous whitewood, conserved against Triplochiton Alef. 1863.
Triploidy syndrome
Triploidy syndrome (69,XXX/XXY/XYY) is a usually prenatally lethal chromosomal condition with 69 chromosomes from an extra haploid set; diandric forms cause partial molar pregnancy, digynic forms do not.
TRIPOD statement
The TRIPOD statement, short for Transparent Reporting of a multivariable prediction model for Individual Prognosis Or Diagnosis, is a 22-item 2015 reporting guideline for clinical prediction model studies, replaced by TRIPOD+AI in 2024.
TRIPOD+AI
TRIPOD+AI is a 27-item reporting guideline for studies developing or validating clinical prediction models with regression or machine learning, published in the BMJ in April 2024.
Tripoli (district)
Tripoli District (Tarabulus, LY-TB) is a first-order administrative division of Libya in northwestern Tripolitania containing the capital, population about 1,065,405, seat of the Government of National Unity.
Tripoli (game)
Tripoli, or Three in One, is a card game for 4-7 players combining pay-card stakes, poker, and Michigan stops on one deal; sold as TRIPOLEY, Rummoli, Michigan Rummy, and Royal Rummy, derived from Poch.
Tripoli Grand Prix
Tripoli Grand Prix (Gran Premio di Tripoli), motor race in Italian Libya 1925-1940; from 1933 on the 13.14 km Mellaha salt-lake circuit, lottery-funded, with German Mercedes-Benz and Auto Union dominance 1935-1939 and a final 1940 win by Farina's Alfa Romeo 158.
Tripoli Rocketry Association
The Tripoli Rocketry Association (TRA) is an American non-profit, incorporated in 1986, that certifies high-power rocketry with the NAR and runs the annual LDRS and BALLS national launches.
Tripoli Zoo
Tripoli Zoo (حديقة حيوان طرابلس), also called Abu Salim Zoo, is a 45-hectare zoo in Tripoli, Libya. Closed since 2009 and later used as an SSA militia base, it was renovated and reopened on Eid al-Fitr, 20 March 2026.
Tripoli-Mellitah Gas Pipeline
The Tripoli-Mellitah Gas Pipeline is a 158 km natural gas pipeline in Libya running from Tripoli to the Mellitah complex, operated by Sirte Oil Company.
Tripoli, Lebanon
Tripoli (طرابلس, Tarabulus al-Sham) is Lebanon's second-largest city and North Governorate capital, 81-85 km north of Beirut. A Phoenician three-city union, Crusader county seat, and Mamluk-era hub, it holds Lebanon's richest Mamluk architecture after Cairo, the Niemeyer fairground, and the country's second port.
Tripoli, Libya
Tripoli (طرابلس) is the capital and largest city of Libya on the Mediterranean coast, with about 2 million people in 2015; seat of the Dbeibah government, shaped by Ottoman and Italian rule, and Libya's most violence-prone urban area.
Tripolis (region of Phoenicia)
Tripolis, Phoenicia, was a Phoenician city at modern Tripoli, Lebanon, founded jointly by Aradus, Sidon, and Tyre, and the meeting place of the Phoenician council.
Tripolitania
Tripolitania, historic northwestern region of Libya named for the three ancient cities Oea, Sabratha, and Lepcis Magna; former Ottoman vilayet, Italian colony, and one of Libya's three historic provinces, holding most of Libya's population with Tripoli as capital.
Tripolitania Punic inscriptions
The Tripolitania Punic inscriptions are Punic, Neo-Punic, and Latino-Punic texts from western Libya, including Lepcis Magna, ranging from Carthaginian rule into the fourth century AD.
Tripolitanian civil war (1711)
The Tripolitanian civil war (Karamanli coup) of 1711 was the armed struggle for Tripolitania that ended when Ahmed Karamanli seized Tripoli and founded a dynasty lasting until 1835.
Tripolitanian Republic
The Tripolitanian Republic (الجمهورية الطرابلسية) was a short-lived Arab republic declared at Misrata, western Libya, on 16 November 1918, ended by Italy's reconquest in 1923.
TripoSR
TripoSR is an open image-to-3D reconstruction model released by Stability AI and Tripo AI in March 2024, generating a textured 3D mesh from one image.
Tripp Schwenk
Tripp Schwenk (William Douglas Schwenk III, born 1971) is an American backstroke swimmer from Sarasota, Florida; 1996 Olympic gold (4x100 medley relay) and silver (200 backstroke), 1992 Olympian, 1993 short-course world champion.
Trippadidanam
Trippadidanam (ത്രിപ്പടിദാനം) was the 1750 ceremony at Thiruvananthapuram's Padmanabhaswamy temple in which Maharaja Marthanda Varma surrendered Travancore to the deity Sree Padmanabha, ruling thereafter as Padmanabha Dasa.
Trippie Redd
Trippie Redd, stage name of Ohio rapper Michael Lamar White (born 1999), is a SoundCloud-era emo rap artist behind "Love Scars," the Billboard 200 No. 1 mixtape A Love Letter to You 4, and MANSION MUSIK.