All articles starting with H
20,046 articles
Holon
Holon (חולון) is a city of about 192,000 residents southeast of Tel Aviv, Israel, founded in 1940 from five neighborhoods, known for the Design Museum Holon by Ron Arad, Wolfson Medical Center, and large-scale urban renewal.
Holonomic function
A holonomic function, also called a D-finite function, satisfies a linear differential equation with polynomial coefficients; the class follows Zeilberger's holonomic systems approach and contains most special functions.
Holonomy
Holonomy, or the holonomy group, is a construction in differential geometry measuring how parallel transport around closed loops fails to return geometric data to its starting value.
Holoprosencephaly
Holoprosencephaly (HPE) is the most common human forebrain malformation, in which the cerebral hemispheres fail to separate. Alobar, semilobar, lobar, and MIH forms; SHH pathway disruption; about 1 in 10,000 live births.
Holoprosencephaly-postaxial polydactyly syndrome
Holoprosencephaly-postaxial polydactyly syndrome, or pseudotrisomy 13 (OMIM 264480, ORPHA:2166), is a rare autosomal recessive malformation syndrome with holoprosencephaly, postaxial polydactyly, severe facial anomalies, and a normal karyotype, mimicking trisomy 13.
Holoprosencephaly-radial heart renal anomalies syndrome
Holoprosencephaly-radial heart renal anomalies syndrome, or Steinfeld syndrome (OMIM 184705, ORPHA 3186), is a rare autosomal dominant disorder combining holoprosencephaly, radial limb defects, heart and kidney malformations, and absent gallbladder.
Holosiiv Raion
Holosiiv Raion (Голосіївський район) is Kyiv's largest district by area, 156 km², created in October 2001 from the former Moscow district; population about 247,600, with the city's highest green-space provision and major universities.
HoloSolis
HoloSolis is a French solar manufacturing startup, founded in 2022 by EIT InnoEnergy, IDEC Group, and TSE, building a 5 GW photovoltaic gigafactory at Sarreguemines-Hambach in Moselle, France.
Holosun
Holosun is an American optics company founded in 2013 and based in City of Industry, California, making red dot sights, lasers, and magnifiers manufactured in China.
Holothuria (genus)
Holothuria Linnaeus, 1767, type genus of the sea cucumber class Holothuroidea; about 150–163 tropical shallow-water species in 18 subgenera, order Holothuriida, family Holothuriidae; several species commercially harvested and IUCN-listed.
Holothuria mexicana
Holothuria mexicana, the donkey dung sea cucumber (Ludwigothuria mexicana), is a large Caribbean holothuriid sea cucumber up to about 50 cm, the region's most abundant and commercially important species, fished seasonally in Honduras and Belize and proposed for CITES Appendix II.
Holothuria scabra
Holothuria scabra, the sandfish, is a high-value tropical sea cucumber of the Indo-Pacific sold dried as beche-de-mer; it is the only tropical holothuroid mass-produced in hatcheries and is heavily overfished.
Holothuroid systematics and phylogeny
Holothuroid systematics and phylogeny is the higher-level classification of sea cucumbers, where the traditional five-order scheme has been replaced by orders derived from molecular phylogenies.
Holotomography
Holotomography is an X-ray phase-contrast imaging technique, introduced by Cloetens and colleagues in 1999, that reconstructs a sample's 3D refractive index from inline holograms recorded at multiple distances or energies.
Hols: Prince of the Sun
Hols: Prince of the Sun (太陽の王子 ホルスの大冒険, Little Norse Prince Valiant) is Toei Animation's 1968, 82-minute feature, Isao Takahata's directorial debut with Hayao Miyazaki on scene design, about a boy, the Sword of the Sun, and the demon Grunwald.
Holst (Mercurian crater)
Holst is a 170 km peak-ring impact basin on Mercury at -17.42, 315.04, named for British composer Gustav Holst (1874-1934) and IAU-approved April 24, 2012 from MESSENGER data.
Hölstein
Hölstein (Hulestein, first record 1101–03) is a municipality in Waldenburg district, canton Basel-Landschaft, Switzerland, home of watchmaker Oris since 1904 and of the Roman villa at Hinterbohl whose 15 m² mosaic is displayed at Augusta Raurica.
Holstein Kiel
Holstein Kiel (KSV Holstein von 1900), German champion 1912, is a football club from Kiel, Schleswig-Holstein; promoted to the Bundesliga in 2024 as its 58th club, relegated after one season, playing at Holstein-Stadion.
Holstein model
The Holstein model is a condensed matter lattice model in which tight-binding electrons couple locally to dispersionless optical phonons, the canonical model for small-polaron formation.
Holston Army Ammunition Plant
Holston Army Ammunition Plant (HSAAP) is a government-owned, contractor-operated U.S. Army facility in Kingsport, Tennessee, founded in 1942 as the Holston Ordnance Works, today the Army's major supplier of RDX, HMX, and IMX high explosives.
Holston River
The Holston River is a 274-mile tributary of the Tennessee River that rises in the Blue Ridge foothills and flows through southwestern Virginia into eastern Tennessee.
Holt Ashley
Holt Ashley (1923–2006) was an American aeronautical engineer and Stanford professor known for aeroelasticity, elected to the National Academy of Engineering in 1970 and awarded the 2003 Daniel Guggenheim Medal.
Holt McCallany
Holt McCallany (Holt Quinn McAloney) is an American actor known as FBI agent Bill Tench in Netflix's Mindhunter (2017–2019), lead of FX's Lights Out (2011), Fritz Von Erich in The Iron Claw, and Harlan Buckley in The Waterfront (2025).
Holt-Oram syndrome
Holt-Oram syndrome (heart-hand syndrome type 1, HOS) is an autosomal dominant disorder caused by TBX5 mutations on 12q24.1, combining radial-ray upper-limb defects, septal heart defects, and cardiac conduction disease; prevalence about 1 per 100,000 births.
Holtedahlfonna
Holtedahlfonna, also called Plateau Holtedahl, is a 1,375 km2 polythermal ice cap in Haakon VII Land, northwestern Spitsbergen, Svalbard; the second largest on Spitsbergen, it feeds the tidewater glacier Kronebreen and hosts ice core and mass balance monitoring.
Holter monitor
Holter monitor: wearable ambulatory ECG device recording heart rhythm continuously for 24-48 hours; invented by Norman J. Holter in the 1950s, patented 1965, used to detect arrhythmias.
Holtzbrinck Publishing Group
Holtzbrinck Publishing Group (Verlagsgruppe Georg von Holtzbrinck) is a private, family-controlled media holding based in Stuttgart, Germany, which owns Macmillan, Digital Science, and a majority stake in Springer Nature.
Holy Alliance
The Holy Alliance was a treaty signed in Paris on 26 September 1815 by Austria, Prussia, and Russia pledging Christian principles in governance; largely symbolic, it ended with Alexander I's death in 1825.
Holy anointing oil
Holy anointing oil, Hebrew shemen ha-mishcha, is the sacred oil of Exodus 30: olive oil blended with myrrh, cinnamon, aromatic cane, and cassia to anoint the Tabernacle and priests.
Holy Blood Altar
The Holy Blood Altar (Heilig-Blut-Altar) is a carved limewood altarpiece by Tilman Riemenschneider, made between 1501 and 1505 for St. James's Church in Rothenburg ob der Tauber.