All articles A–Z

AltSchool

AltSchool was a San Francisco education technology startup founded by Max Ventilla in 2013. It operated private microschool labs while developing a learning platform.

Oct 22, 2026

Altun Ha

Altun Ha is the ruins of an ancient Maya city in Belize, about 50 km north of Belize City, occupied from about 200 BC to AD 925.

Sep 23, 2026

Altuntash

Altuntash (آلتونتاش), in full Abu Sa'id Altuntash Hajeb, was a Turkic slave commander of the Ghaznavid sultans who governed Khwarazm as Khwarazmshah from 1017 to 1032.

Altyn (Алтын) (helmet)

The Altyn (Алтын) is a Soviet and Russian titanium assault helmet with an armored visor, developed by NII Stali for KGB special-forces units and later used chiefly by the FSB.

Sep 19, 2026

Altyn-Depe

Altyn-Depe (Altyn Tepe) is a Chalcolithic and Bronze Age settlement mound in southern Turkmenistan, occupied from the 5th millennium BC and known for a four-stepped ziggurat-style temple.

Altyn-Emel Biosphere Reserve

Altyn-Emel Biosphere Reserve is a UNESCO Man and the Biosphere reserve in southeastern Kazakhstan, designated in 2017 and covering about 535,900 hectares of desert and mountains.

Alu Alkhanov (Алу Дадашевич Алханов)

Alu Alkhanov (Алу Дадашевич Алханов), born 1957, Chechen police general, president of Chechnya 2004–2007 as Kremlin's interim choice, then Deputy Minister of Justice of Russia since 2007.

Alu element

Alu element: primate-specific SINE retrotransposon derived from 7SL RNA; over 1 million copies, 11% of the human genome; mobilized by L1 ORF2p via TPRT; causes disease by insertion and recombination.

Alucard (Adrian Fahrenheit Tepes) is the dhampir son of Dracula in Konami's Castlevania series, debuting in Castlevania III: Dracula's Curse and starring in Symphony of the Night (1997), with bat, wolf, and mist transformations and a Netflix anime counterpart.

Alucard (アーカード) (Hellsing)

Alucard (アーカード, Ākādo), formerly Count Dracula, is the vampire antihero of Kohta Hirano's Hellsing manga; his name is Dracula reversed. He serves the Hellsing Organization under Integra, wields the Casull and Jackal, and longs to be killed by a human.

Oct 3, 2026

Alucarda

Alucarda (Alucarda, la hija de las tinieblas) is a 1977 Mexican cult horror film by Juan López Moctezuma, starring Tina Romero and Susana Kamini as possessed convent orphans; panned in Mexico, later a nunsploitation classic.

Oct 22, 2026

Aluda Ketelauri

Aluda Ketelauri (ალუდა ქეთელაური) is an 1888 epic poem by Georgian poet Vazha-Pshavela about a Khevsur warrior who refuses the custom of cutting off his slain enemy's hand.

Aluette

Aluette, or la Vache (the Cow Game), a traditional French trick-taking card game of Vendée and Brittany played by four in partnerships with a 48-card Spanish-suited deck, tied tricks, and legal partner signaling.

Aluf (אלוף)

Aluf (אלוף) is a senior rank in the Israel Defense Forces, equivalent to major general, drawn from a Biblical Hebrew word meaning "champion" and ranked below rav aluf.

Oct 22, 2026

Aluísio Azevedo

Aluísio Azevedo, full name Aluísio Tancredo Gonçalves de Azevedo, was a Brazilian novelist and diplomat who introduced literary naturalism to Brazil with O mulato (1881) and O cortiço (1890).

Alulak

Алулак (Tajik: Алӯлак) is a name shared by three subjects: a theme park in Dushanbe, Tajikistan; a village in Qazvin Province, Iran; and a kid goat in a Tajik folk tale.

Sep 19, 2026

Alulim

Alulim, also known as Aloros in Berossus, is the legendary antediluvian first king of Eridu in the Sumerian King List, which credits him with a 28,800-year reign.

Alum

Alum is any of a group of hydrated double sulfate salts, most commonly potassium alum, used as a mordant in dyeing, a flocculant in water purification, and an astringent.

Alum Bay

Alum Bay, Isle of Wight: bay at the island's western tip beside the Needles, famed for 21 shades of coloured sand, vertical Tertiary cliffs, its Elizabethan alum name, Marconi's 1897 radio station, and the Needles Landmark Attraction chairlift.

Alumar

Alumar (Consórcio de Alumínio do Maranhão) is an integrated alumina refinery and aluminum smelter complex near São Luís, Brazil, begun in 1984 and operated by Alcoa.

Alumina

Alumina, or aluminum oxide (Al₂O₃), is a hard, heat-resistant ceramic made from bauxite by the Bayer process, serving as the feedstock for aluminum and a key technical ceramic.

Alumina ceramic

Alumina ceramic is a dense, sintered, polycrystalline body of aluminum oxide (Al₂O₃) and the most widely used advanced technical ceramic, used in electronics, orthopedics, and wear parts.

Alumina coating (cutting tools)

An alumina coating is a thin aluminum oxide layer on a cutting tool insert that resists heat and chemical wear, extending tool life by 10 times or more.

Aluminij Mostar

Aluminij Mostar is an aluminum company in Mostar, Bosnia and Herzegovina, established in 1975; its smelter closed in 2019 and the plant now operates as a casthouse under a lease by the M.T. Abraham Group.

Aluminium

Aluminium, element 13 on the periodic table, is a lightweight silvery-white metal and the Earth's crust's most abundant metal, widely used in transport, construction, and packaging.

Aluminium alloy

An aluminum alloy, also called Al alloy, is aluminum with elements such as copper, magnesium, silicon, or zinc added for strength, second only to steel among structural metals.

Aluminium ammonium sulphate

Aluminium ammonium sulphate (ammonium alum, INS 523, CAS 7784-25-0/7784-26-1) is a colourless double sulphate alum used as a food additive, topical astringent, and EU-approved bird and mammal repellent.

Aluminium Bahrain

Aluminium Bahrain, known as Alba, is a Bahraini aluminum producer whose Askar smelter, the first in the Middle East, poured its first metal in May 1971.

Aluminium Bahrain power station

The Aluminium Bahrain power station is the captive gas-fired power complex of the Alba aluminum smelter at Askar, Bahrain, grown to about 4,200 MW since 1971.