All articles A–Z
519,064 articles
Sisowath Monivong
Sisowath Monivong (ស៊ីសុវត្ថិ មុនីវង្ស, 1875–1941) was King of Cambodia from 1927 to 1941 under French rule, founding the Buddhist Institute in 1930 and succeeded by Norodom Sihanouk.
Sisowath Sirik Matak
Sisowath Sirik Matak (1914–1975) was a Cambodian prince and politician who led the 1970 coup deposing his cousin, King Norodom Sihanouk, and was executed by the Khmer Rouge in 1975.
Sisqó
Sisqó (Mark Althavan Andrews, born 1978), American R&B singer, lead vocalist of Dru Hill; solo hits "Thong Song" (Hot 100 No. 3) and "Incomplete" (No. 1) from Unleash the Dragon (1999); four 2001 Grammy nominations, zero wins.
Sisse Marie Welling
Sisse Marie Welling (born 1986) is a Danish Socialist People's Party politician and Lord Mayor of Copenhagen from 1 January 2026, previously Mayor of Health and Care since 2018.
Sissel Kyrkjebø
Sissel Kyrkjebø, known as Sissel, is a Norwegian soprano born 1969 in Bergen, a classical crossover singer famous for the 1986 Eurovision breakthrough, the Lillehammer 1994 Olympics, and the Titanic soundtrack.
Sissi – Fateful Years of an Empress
Sissi – Fateful Years of an Empress (Sissi – Schicksalsjahre einer Kaiserin, 1957) is Ernst Marischka's third Sissi film with Romy Schneider and Karlheinz Böhm, covering Elisabeth's Hungary years, illness, and Italian journey.
Sissi – The Young Empress
Sissi – The Young Empress (Sissi, die junge Kaiserin, 1956) is Ernst Marischka's second Sissi trilogy film, starring Romy Schneider as Empress Elisabeth adjusting to court life, Sophie's control, and the Hungarian coronation.
Sissi (film)
Sissi (1955) is an Austrian historical romance film by Ernst Marischka, the first of the Sissi trilogy, starring Romy Schneider as Empress Elisabeth and Karlheinz Böhm as Franz Joseph; a record postwar Austrian box-office hit and German Christmas TV tradition.
SISSO
SISSO, short for sure independence screening and sparsifying operator, is a materials-informatics algorithm using symbolic regression and compressed sensing to find short formulas that predict material properties.
Sissy
Sissy is a derogatory American term for a man or boy perceived as weak or effeminate. It originated from the word sister in the late 1800s.
Sissy hypno
Sissy hypno, also known as sissy hypnosis or autogynephilic persuasive pornography, is a genre of online pornography using edited mainstream videos with persuasive captions or audio encouraging erotic self-feminization.
Sissy Schwarz
Sissy Schwarz (Elisabeth Schwarz-Bollenberger, born 19 May 1936, Vienna), Austrian pair skater with Kurt Oppelt: 1956 Olympic, World, and European pairs champion, five-time Austrian champion, also 1952 Olympian in singles.
Sissy Spacek
Sissy Spacek, also known as Mary Elizabeth Spacek, is an American actress born 1949 in Quitman, Texas, who won the Best Actress Oscar for Coal Miner's Daughter (1980) and earned six Best Actress nominations, including for Carrie, Missing, and In the Bedroom.
Sist
Sist was the land revenue tax of the Vijayanagara Empire, generally one-sixth of the gross produce though sometimes raised to fifty percent, and it remained a byword into the British period.
Sistan (سیستان)
Sistan (سیستان), also Sakastan or Sijistan, is a historical region of the lower Helmand basin straddling the Iran-Afghanistan border, home of the 9th-century Saffarid dynasty and subject of the Persian Tarikh-e Sistan.
Sistan and Baluchestan
Sistan and Baluchestan (سیستان وبلوشستان), Iran's southeastern province with capital Zahedan, borders Afghanistan and Pakistan. Predominantly Sunni and Baloch, it ranks last among Iranian provinces in development and faces drought, dust storms, and the Jaish al-Adl insurgency.
Sistar (씨스타)
Sistar (씨스타), a four-member K-pop girl group from Starship Entertainment, debuted June 3, 2010 with "Push Push" and disbanded in 2017. Known for summer hits "Loving U," "Touch My Body," and "Shake It," and the sub-unit SISTAR19.
Sistas (TV series)
Tyler Perry's Sistas is a BET comedy-drama premiering October 23, 2019, following four single Black women in Atlanta (Andi, Danni, Karen, Sabrina). Now in its 10th season with 212 episodes, spinoffs Zatima and Divorced Sistas, and top cable ratings among Black adults 18-49.
SiSTEM-NEO trial
SiSTEM-NEO (NCT07018739) is a Mahidol University pilot double-blind trial at Siriraj Hospital, Bangkok, testing three IV infusions of Wharton's jelly MSCs (2×10^6 cells/kg) after cooling in 40 infants with neonatal HIE.
Sistema Arrecifal Veracruzano Biosphere Reserve
Sistema Arrecifal Veracruzano Biosphere Reserve (Parque Nacional Sistema Arrecifal Veracruzano): UNESCO MAB reserve off Veracruz, Mexico, nominated 2006, 961,268 ha; national park created 1992, expanded 2012; first mass coral bleaching 2023.
Sistema de Humedales de la Bahía de Bluefields
Sistema de Humedales de la Bahía de Bluefields: Nicaraguan Ramsar wetland site (86,501 ha, designated 2001) around Bluefields Bay coastal lagoon, fed by the Río Escondido basin; distinct from Bluefields Bay, Jamaica.
Sistema de Humedales de la Zona Sur de Honduras
Sistema de Humedales de la Zona Sur de Honduras, Ramsar site no. 1000: seven coastal wetland areas on the Golfo de Fonseca (Choluteca and Valle), designated 10 July 1999, 69,711 ha extended to 75,031.13 ha, mangrove ecosystem threatened by shrimp aquaculture.
Sistema de Humedales Remanentes del Delta del Río Colorado
Sistema de Humedales Remanentes del Delta del Río Colorado, Ramsar site 1822: a 127,614 ha wetland of international importance in Baja California and Sonora, Mexico, designated 2 February 2008, protecting remnant Colorado River Delta wetlands along the Pacific Flyway.
Sistema Delta Estuarino del Río Magdalena, Ciénaga Grande de Santa Marta
Sistema Delta Estuarino del Río Magdalena, Ciénaga Grande de Santa Marta (SDERM CGSM): Colombia's largest coastal lagoon and first Ramsar site (1998, site 951), a Caribbean brackish wetland hit by causeway-driven mangrove die-off, partially rehabilitated by 1990s dredging, and invaded by Hydrilla verticillata in 2025.
Sistema Dos Ojos
Sistema Dos Ojos, a flooded cave system near Tulum, Quintana Roo, Mexico, named for two eye-like cenotes. About 84 km long, it was connected to Sistema Sac Actun in January 2018 and absorbed as its Dos Ojos region; El Pit reaches 119 m.
Sistema Hidrológico de Soncor del Salar de Atacama
Sistema Hidrológico de Soncor del Salar de Atacama, Ramsar Site 876 (designated 2 December 1996, 67,133 ha), is a Chilean high-Andean wetland of shallow saline lagoons (Puilar, Chaxa, Barros Negros) fed by eastern groundwater, a key breeding site for three flamingo species within Los Flamencos National Reserve.
Sistema Lagunar Agiabampo - Bacorehuis - Río Fuerte Antiguo
Sistema Lagunar Agiabampo-Bacorehuis-Río Fuerte Antiguo, Ramsar site 1797, is a 90,804 ha five-lagoon coastal wetland on the Sonora-Sinaloa border, Gulf of California, designated 2 February 2008, with mangroves, migratory birds, and blue shrimp habitat.
Sistema Lagunar San Ignacio - Navachiste - Macapule
Sistema Lagunar San Ignacio-Navachiste-Macapule (Ramsar site 1826) is a 79,873-ha coastal lagoon system in northern Sinaloa, Mexico, with three bays, mangroves, 21 at-risk species, and shrimp fisheries.
Sistema Nacional de Gasoductos (SNG)
The Sistema Nacional de Gasoductos (SNG) is Mexico's core natural gas transmission network, a roughly 8,582-kilometer pipeline system operated by CENAGAS and serving industrial, electric, and distribution users.
Sistema Ox Bel Ha
Sistema Ox Bel Ha ("Three Paths of Water") is the world's longest underwater cave, a flooded karst system south of Tulum, Quintana Roo, Mexico, surveyed at 541,791 m by CINDAQ in 2025, explored since 1997, and second only to Mammoth Cave among all caves.