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Sisters in Yellow
Sisters in Yellow (黄色い家, Kiiroi ie) is Mieko Kawakami's 2023 crime-suspense novel about Hana Ito and three women running the Tokyo bar Lemon in the 1990s; it won the 2024 Yomiuri Prize and appeared in English from Knopf in 2026.
Sisters of Charity
Sisters of Charity is the name shared by numerous distinct Roman Catholic congregations of non-cloistered women religious, many following a rule based on the Daughters of Charity founded in Paris in 1633.
Sisters of Loreto
Sisters of Loreto, or Institute of the Blessed Virgin Mary (IBVM), is a Catholic women's congregation founded by Mary Ward in 1609 at St Omer, dedicated to girls' education; Teresa Ball founded the Irish Rathfarnham branch in 1822, and in November 2025 IBVM merged with the Congregatio Jesu into the Congregation of Jesus.
Sisters of Mercy
The Sisters of Mercy, or Mercy Sisters, are a Catholic religious congregation founded in Dublin in 1831 by Catherine McAuley to serve the poor, the sick, and the uneducated.
Sisters of Perpetual Indulgence
Sisters of Perpetual Indulgence (SPI), also Order of Perpetual Indulgence: international order of queer and trans drag nuns founded in San Francisco, Easter 1979; vows to promulgate universal joy and expiate stigmatic guilt; AIDS-era safer-sex pioneers with 65+ houses in 10 countries.
Sisters of the Gion (祇園の姉妹)
Sisters of the Gion (祇園の姉妹, Gion no kyōdai) is Kenji Mizoguchi's 1936 Japanese black-and-white drama about two geisha sisters in Kyoto's Gion, scripted by Yoshikata Yoda, first in Kinema Junpo's 1936 Best Ten, remade in 1956.
Sistine Chapel
The Sistine Chapel (Cappella Sistina) is the Vatican Palace's principal papal chapel, built 1477–1480 for Sixtus IV, decorated by Perugino, Botticelli, and Ghirlandaio, and frescoed by Michelangelo with the Genesis ceiling (1508–1512) and Last Judgment (1536–1541); it hosts papal conclaves.
Sistine Chapel ceiling
Sistine Chapel ceiling: vault of the Vatican's main papal chapel, frescoed by Michelangelo 1508–1512 with nine Genesis scenes, twelve Prophets and Sibyls, and ancestors of Christ; seat of the papal conclave since 1878 and restored 1979–1999.
Sistine Madonna
Sistine Madonna (Madonna di San Sisto), Raphael's 1512–1513 oil altarpiece for San Sisto, Piacenza, commissioned by Pope Julius II, showing Madonna, Child, Sixtus II, Barbara, and putti; held in Dresden's Gemäldegalerie Alte Meister since 1754.
Sistrurus
Sistrurus, the massasauga and pygmy rattlesnake genus, is the small sister genus of Crotalus with nine large head plates, three North American species, and a simpler venom of 22 protein families.
Sistrurus catenatus
Sistrurus catenatus, the Eastern Massasauga, is a small venomous pit viper of the North American Great Lakes region, threatened in the US (2016) and Canada (COSEWIC 2025) by habitat loss, road mortality, and persecution.
Sisu
Sisu is a Finnish cultural concept denoting determination in the face of adversity. It is associated with the Winter War (1939–1940) and is measured by the Sisu Scale.
Sisu (film)
Sisu is a 2022 Finnish action film by Jalmari Helander starring Jorma Tommila as gold prospector Aatami Korpi, who wipes out Nazis in WWII Lapland; 6-million-euro budget, $11.7m gross, sequel Sisu: Road to Revenge (2025).
Sisu Beda
Sisu Beda is a short early Odia religious text of Saivite tantric content, described in its 1984 edition record as the earliest literary prose in Odia.
Sisu: Road to Revenge
Sisu: Road to Revenge (2025) is Jalmari Helander's sequel to Sisu, starring Jorma Tommila as Aatami Korpi against Stephen Lang's Red Army commander; released by Screen Gems November 21, 2025, 93% on Rotten Tomatoes.
Sisupalgarh Mound
Sisupalgarh Mound is the remains of a fortified Early Historic city in Odisha, India, on the edge of Bhubaneswar, enclosed by a square rampart about 1.1 km on each side.
Sisymbrium
Sisymbrium (hedge mustards, rockets) is a genus of Brassicaceae herbs published by Linnaeus in 1753, lectotype S. altissimum; about 41-90 species, Miocene origin in the Irano-Turanian region, yellow flowers and 3-nerved linear siliques.
Sisyphi Cavi
Sisyphi Cavi, a 430-km-wide system of pits in southern Noachis Terra near Mars's south pole, carved into Hesperian ice-sheet remnants, with landslides, active gullies, and a basal-melting origin.
Sisyphi Montes
Sisyphi Montes, a 200-km-wide group of mountains in the southern highlands of Mars near 70S, 13E, interpreted as flat-topped volcanoes that erupted beneath an ancient Hesperian ice sheet, with CRISM sulfate and clay evidence.
Sisyphi Planum
Sisyphi Planum, also Sisyphi Montes and Sisyphi Cavi, is a 1,033-km-wide high-latitude plateau in Mars' southern highlands between Argyre and Hellas, named in 2003, with mineral evidence of subglacial volcanism and active gullies.
Sisyphus (Σίσυφος)
Sisyphus (Σίσυφος), mythical king and founder of Corinth, son of Aeolus, who twice cheated death by chaining Thanatos and tricking the underworld, and was punished in Hades to roll a boulder eternally; famous from Homer's Odyssey and Camus' 1942 essay.
Sisyphus cooling
Sisyphus cooling, also called the Sisyphus effect, is a sub-Doppler laser cooling mechanism in which atoms repeatedly climb light-shift potential hills and are optically pumped back down.
Sisyphus: The Myth (시지프스)
Sisyphus: The Myth (시지프스) is a 2021 JTBC 10th-anniversary sci-fi drama, 16 episodes, starring Cho Seung-woo as engineer Han Tae-sul and Park Shin-hye as time traveler Kang Seo-hae, directed by Jin Hyuk, streamed on Netflix.
Sisyrinchium
Sisyrinchium (blue-eyed grass), genus of annual and perennial herbs in Iridaceae, native from Hawaii and the Americas to the Falkland Islands, with about 212 accepted species, ten phylogenetic sections, and oil-producing flowers in some lineages.
Sit and reach test
The sit and reach test, introduced by Wells and Dillon in 1952, measures forward reach from a seated position with legs extended as a practical index of hamstring flexibility.
Sit-in
Sit-in: a nonviolent direct-action tactic of occupying a space and refusing to leave, also called sit-down. Known for the 1960 Greensboro lunch counter sit-ins, 1936–37 labor sit-down strikes, and the 28-day 1977 Section 504 occupation.
Sit-Shamshi bronze
The Sit-Shamshi bronze is a 12th-century BC Elamite bronze model of a sunrise ritual, made for King Šilhak-Inšušinak I and found at Susa, now in the Louvre.
Sit-ski and monoski
A sit-ski is para winter sport equipment with a molded seat on a frame above skis; the monoski is its alpine version on a single ski.
Sit-up
Sit-up: a supine trunk-flexion exercise training abdominals and hip flexors, long a military and school fitness test event (2-minute Army APFT sit-ups), now widely replaced by planks and curl-ups over lumbar loading concerns.
Sita (सीता)
Sita (सीता), also Sītā, is the heroine of the Ramayana: Rama's wife, abducted by Ravana, tested by fire, and finally received by the Earth. Known for hundreds of retellings, from Valmiki's Sanskrit epic to feminist Sitayanas.