All articles starting with K
16,083 articles
K-shell ionization
K-shell ionization is the removal of an atom's innermost 1s electron by a photon, electron, or ion, leaving a vacancy that relaxes by X-ray or Auger emission.
k-space (MRI)
In magnetic resonance imaging, k-space is the raw data space holding spatial Fourier transform samples of the object; the image is recovered afterward by Fourier reconstruction.
K-stability
K-stability is an algebro-geometric stability condition for Fano varieties, introduced by Gang Tian and reformulated algebraically by Simon Donaldson, that characterizes which Fano manifolds admit Kähler–Einstein metrics.
K-SVD
K-SVD is an iterative dictionary learning algorithm that trains an overcomplete dictionary so signals can be approximated sparsely, introduced by Aharon, Elad, and Bruckstein in 2006.
K-theory
K-theory is a branch of mathematics assigning algebraic invariants, the K-groups, to spaces, rings, and operator algebras; introduced by Grothendieck in 1957, it splits into algebraic and topological branches.
K-Tino
K-Tino, born Catherine Edoa Ngoa in 1966 in Yaoundé, is a Cameroonian bikutsi singer known as "la femme du peuple" and the mother of modern bikutsi.
K-Touch
K-Touch (天语) is a Chinese mobile phone brand of Beijing Tianyu Langtong, founded by Rong Xiuli in 2002 and China's top-selling domestic handset maker from 2007 to 2009.
K-Trap
K-Trap is the stage name of Devonte Perkins, a South London UK drill and trap rapper. Known for his early balaclava persona, 2017 mixtape The Last Whip, Headie One collaboration Strength to Strength, and 2024 album SMILE?; distinct from other artists named K-Trap.
K-truss
The K-truss is a bridge truss configuration whose web members form a repeated K pattern, a modification of the Parker truss prized for large spans.
K-type main-sequence star
A K-type main-sequence star, or orange dwarf, is a cool hydrogen-burning star slightly smaller and dimmer than the Sun, a favored target in the search for habitable exoplanets.
K-V Pharmaceutical Co
K-V Pharmaceutical Co was a Missouri-based specialty pharmaceutical company focused on women's healthcare, known for the premature-birth drug Makena, which filed Chapter 11 in 2012.
K-Way
K-Way is a Franco-Italian clothing brand, created in Paris in 1965 by Léon-Claude Duhamel, known for a waterproof nylon jacket that folds into its own pouch.
K-wire fixation
K-wire fixation is an orthopedic technique in which thin Kirschner wires are drilled through bone to hold fractures in alignment while they heal, mainly in the hand.
K-Y Jelly
K-Y Jelly is an American water-based personal lubricant brand, first sold as a prescription medical product in 1917, over the counter since 1980, and owned since 2014 by Reckitt.
K–12
K–12 (kindergarten through 12th grade) is the American shorthand for pre-college schooling, now used internationally. Covers the ~49.5 million U.S. public enrollment, school sectors, history, and the global K-12 market.
K–12 (film)
K-12 (2019) is a musical fantasy film written, directed by, and starring Melanie Martinez as the visual accompaniment to her second album, featuring all 13 album tracks, filmed in Hungarian palaces, released in limited theaters and free on YouTube.
K–Ar dating
K–Ar dating, also called potassium–argon dating or K-Ar, is a radiometric dating method that determines the age of volcanic rocks and minerals from the decay of radioactive potassium-40 to argon-40.
K: Missing Kings (劇場版 K MISSING KINGS)
K: Missing Kings (劇場版 K MISSING KINGS) is a 2014 Japanese anime film by GoRA and GoHands, a sequel to the 2012 K series, following Kuroh and Neko's search for Shiro and Anna Kushina's rise as the new Red King.
K. A. Nilakanta Sastri
K. A. Nilakanta Sastri (1892–1975) was an Indian historian of South India whose works, including The Cholas and A History of South India, remain standard references.
K. A. Paul (కిలారి ఆనంద్ పాల్)
K. A. Paul, born Kilari Anand Paul, is an Indian-born evangelical preacher based in Houston, Texas, who founded Global Peace Initiative and Gospel to the Unreached Millions.
K. A. Sengottaiyan
K. A. Sengottaiyan, born in 1948, is an Indian politician and Tamil Nadu minister for Revenue, Disaster Management, and Legislative Assembly, representing the Tamilaga Vettri Kazhagam.
K. A. Thulasi
K. A. Thulasi is an Indian National Congress politician who serves as Kerala's minister for welfare of scheduled castes, tribes, and backward classes, representing Kongad.
K. Alex Müller
K. Alex Müller (Karl Alexander Müller) was a Swiss physicist at IBM Zurich who co-discovered high-temperature superconductivity in 1986 and won the 1987 Nobel Prize.
K. Anji Reddy
Kallam Anji Reddy was an Indian pharmaceutical entrepreneur who founded Dr. Reddy's Laboratories in Hyderabad in 1984, built it into one of India's largest drug companies, and died in 2013.
K. Annamalai (கே. அண்ணாமலை) (BJP politician)
K. Annamalai (கே. அண்ணாமலை), ex-IPS Karnataka cadre officer and Tamil Nadu BJP president 2021–2025, ran the En Mann En Makkal yatra and DMK Files campaign, lost Aravakurichi 2021 and Coimbatore 2024, quit the BJP on 5 June 2026, and launched the We The Leaders movement targeting the 2031 Assembly election.
K. Armstrong
K. Armstrong (Veera Kesavan, 1972-2024) was a lawyer, Ambedkarite Buddhist, and BSP Tamil Nadu president hacked to death in Perambur, Chennai, on 5 July 2024; the Madras High Court later transferred the probe to the CBI.
K. Asif (کریم الدین آصف)
K. Asif (Karimuddin Asif, 1922-1971), Indian Hindi film director from Etawah, creator of Mughal-e-Azam (1960); also directed Phool (1945) and the posthumous Love and God (1986).
K. B. Ganesh Kumar
K. B. Ganesh Kumar (Keezhoote Balakrishna Ganesh Kumar), Kerala politician and Malayalam film actor, MLA for Pathanapuram since 2001 for Kerala Congress (B), Transport Minister 2001–2003, Forest, Sports & Cinema Minister 2011–2013, and Transport Minister again since December 2023.
K. B. Hedgewar
K. B. Hedgewar (Doctorji), 1889–1940, Nagpur physician and founder of the Rashtriya Swayamsevak Sangh (RSS) in 1925; first Sarsanghchalak, ex-Anushilan Samiti member, jailed twice, succeeded by Golwalkar.
K. Balachander (கைலாசம் பாலசந்தர்)
K. Balachander (கைலாசம் பாலசந்தர், 1930–2014), also called Iyakkunar Sigaram, was an Indian Tamil filmmaker and playwright who directed about 101 films, won the Dadasaheb Phalke Award, and launched Rajinikanth, Kamal Haasan, and Sridevi.