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Arrest of Marcy Rheintgen
March 19, 2025 arrest of Marcy Rheintgen, a 20-year-old transgender woman from Illinois, for trespassing after using a women's restroom at the Florida Capitol under HB 1521; the first known arrest under such a ban, dismissed June 20, 2025 on speedy-trial grounds.
Arrest of Rodrigo Duterte
Arrest of Rodrigo Duterte: former Philippine president detained 11 March 2025 in Manila on an ICC warrant for the crime against humanity of murder over his drug war; first former Asian head of state arrested by the ICC; charges confirmed April 2026.
Arrest of the Gang of Four
The Arrest of the Gang of Four (粉碎四人帮) was the seizure of Wang Hongwen, Zhang Chunqiao, Jiang Qing, and Yao Wenyuan in Beijing on 6 October 1976.
Arrest of Yoon Suk Yeol
Arrest of Yoon Suk Yeol: the January 15, 2025 CIO detention of South Korea's impeached president at his Seoul residence, the first sitting presidential arrest, after a failed January 3 attempt and a martial law warrant.
Arrest warrant
Arrest warrant: a judicial order authorizing an officer to arrest a named person, issued on probable cause. Covers U.S. federal Rule 4, warrantless arrests (Watson 1976), general warrants, bench, administrative, European, ICC, and geofence warrants.
Arri Coser
Arri Coser is a Brazilian restaurateur from Encantado, Rio Grande do Sul, who co-founded Fogo de Chão in Porto Alegre and now leads the MDR Group of restaurants.
Arrival of Francis Xavier in Japan
The arrival of Francis Xavier in Japan was the landing of the Spanish Jesuit missionary at Kagoshima on August 15, 1549, the first arrival of Christianity in Japan.
Arrival of Ganjin in Japan
The arrival of Ganjin in Japan was the 753 landing of the Chinese Buddhist master Ganjin at Akizuma-no-ura, Kagoshima, succeeding on his sixth crossing attempt.
ArriVent Biopharma
ArriVent Biopharma is an American clinical-stage biopharmaceutical company founded in 2021 that develops firmonertinib, an oral EGFR inhibitor for lung cancer, and antibody-drug conjugates; it listed on Nasdaq in 2024.
Arron Banks
Arron Banks is a British insurance entrepreneur and political donor who co-founded the Leave.EU campaign. His significant funding led to investigations by the NCA and Electoral Commission.
Arrow (symbol)
Arrow symbols: line-and-head marks showing direction, electron flow (curved arrows, Robinson 1920s), biological processes, implication, or wayfinding; Unicode encodes them at U+2190–21FF and allied blocks, unmirrored in RTL text.
Arrow 3
Arrow 3 is an Israeli-American exo-atmospheric anti-ballistic missile interceptor, jointly developed by Israel and the United States, that destroys long-range ballistic missiles in space; it entered Israeli service in 2017.
Arrow Cross Party
Arrow Cross Party (Nyilaskeresztes Párt), Ferenc Szálasi's fascist, antisemitic Hungarian party; largest fascist movement after 1935, ruled Nazi-occupied Hungary October 1944 to March 1945, murdered thousands of Budapest Jews.
Arrow Electronics
Arrow Electronics is an American distributor of electronic components and enterprise computing products, founded in 1935 and incorporated in New York in 1946, with 2025 revenue of $30.9 billion.
Arrow–Debreu model
The Arrow–Debreu model is the formal general-equilibrium model of a private ownership economy, introduced by Kenneth Arrow and Gérard Debreu in a 1954 paper proving competitive equilibrium exists.
Arrow's impossibility theorem
Arrow's impossibility theorem, also called the general possibility theorem from Social Choice and Individual Values, proves no ranked preference aggregation rule satisfies unrestricted domain, Pareto, non-dictatorship, and IIA for three or more alternatives.
Arrowhead
Arrowhead: the tip of an arrow, usually small knapped stone, bone, or metal; archaeologists prefer "projectile point." Oldest claimed examples ~80,000 years (Obi-Rakhmat, Uzbekistan); bow reached eastern North America by Woodland times.
Arrowroot Capital
Arrowroot Capital, formally Arrowroot Capital Management, LLC, is a growth equity firm in Marina del Rey, California, founded by Matthew Safaii to invest in enterprise software and B2B SaaS companies.
Arrowstreet Capital (asset management firm)
Arrowstreet Capital is a Boston-based quantitative institutional asset manager founded in 1999 by former PanAgora executives Bruce Clarke and Peter Rathjens with Harvard economist John Y. Campbell.
Arrukum
Arrukum was a great vizier of the Syrian city-state of Ebla, head of its administration under king Irkab-damu in the second quarter of the 24th century BC.
Ars grammatica
The Ars grammatica is a fourth-century Latin grammar by Aelius Donatus, composed of the Ars minor and Ars maior and standard for roughly a thousand years.
Ars longa, vita brevis
Ars longa, vita brevis: Latin form of Hippocrates' first Aphorism (Ὁ βίος βραχὺς, ἡ δὲ τέχνη μακρὴ), on medicine's long craft versus short life; cited by Seneca, Goethe; often truncated today.
Ars Notoria
Ars Notoria (Notory Art) is a medieval Latin Solomonic grimoire of angelic theurgy using prayers and figures called notae to gain rapid knowledge of the liberal arts; oldest manuscripts thirteenth century, first critical edition by Véronèse 2007.
Ars Technica
Ars Technica: American technology news and analysis website founded 1998 by Ken Fisher in Cambridge, Massachusetts; owned by Advance/Condé Nast since 2008; rated Least Biased/High factual by MBFC, Center by AllSides.
Arsaces I
Arsaces I (ارشک) was the founder of the Arsacid dynasty of Parthia and first king of the Parthians, reigning from about 247 BCE to roughly 211 BCE.
Arsacid dynasty
The Arsacid dynasty (اشکانیان), founded by Arsaces I of the Parni tribe around 247 BC, established and ruled the Parthian empire over Iran and Mesopotamia until AD 224.
Arsacid dynasty of Armenia
The Arsacid dynasty of Armenia (Arshakuni, Արշակունիներ) was a branch of the Parthian Arsacids that ruled Armenia from the first century CE until 428, making Armenia officially Christian in 314.
Arsacid royal road network
The Arsacid royal road network (راههای شاهی اشکانی) was the Parthian Empire's staged system of overland routes with way-stations, inherited from the Achaemenids and running from the Euphrates through Media to India.
Arsacius
Arsacius (Ἀρσάκιος), born in Tarsus before 324, was Ecumenical Patriarch of Constantinople from 404 to 405, the aged brother of Nectarius, installed after John Chrysostom's expulsion and never accepted by the West.
Arsames
Arsames (Aršāma) was a member of the early Achaemenid royal line, named at Behistun as the grandfather of Darius I; whether he reigned is disputed.