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Alpha particle X-ray spectrometer
The alpha particle X-ray spectrometer (APXS) is a contact instrument that determines the elemental composition of rocks and soil, flown on Pathfinder, the Mars Exploration Rovers, and Curiosity.
Alpha Pegasi
Alpha Pegasi, properly named Markab, is the third-brightest star in the constellation Pegasus, a blue-white subgiant about 133 light-years away that forms the Square of Pegasus's southwestern corner.
Alpha Persei
Alpha Persei, known as Mirfak, is a yellow-white F5 Ib supergiant of visual magnitude 1.79 and the brightest star of Perseus, lying at the center of the Alpha Persei open cluster about 600 light-years away.
Alpha Phi
Alpha Phi (ΑΦ) International Fraternity, a women's fraternity (sorority), founded September 18, 1872 at Syracuse University by ten women denied entry to men's fraternities; fourth US national sorority, 175 collegiate chapters, over 280,000 members.
Alpha Phi Alpha
Alpha Phi Alpha Fraternity, Inc., founded December 4, 1906 at Cornell University, is the first intercollegiate Greek-letter fraternity for African American men and the only Black Greek-letter organization founded at an Ivy League school, with about 900 chapters and 200,000 initiates.
Alpha Phi Omega
Alpha Phi Omega (APO) is a national co-educational service fraternity founded December 16, 1925 at Lafayette College by Frank Reed Horton, based on Scout principles, with Leadership, Friendship and Service as its Cardinal Principles and 500,000+ members.
Alpha Piscis Austrini
Alpha Piscis Austrini, better known as Fomalhaut, Arabic for "mouth of the fish," is the brightest star in Piscis Austrinus, 25 light-years from Earth, and hosts a well-studied debris disk.
Alpha process
The alpha process is a sequence of nuclear reactions in stars in which helium-4 nuclei are captured successively by heavier nuclei, building elements from carbon upward through oxygen and beyond.
Alpha Protocol
Alpha Protocol is a 2010 espionage action RPG by Obsidian Entertainment, published by SEGA, starring agent Michael Thorton. Known for its timed Suave/Aggressive/Professional dialogue stances, deep choice-and-consequence reactivity, 2019 delisting, and 2024 GOG restoration.
Alpha recursion theory
Alpha recursion theory (Α-recursion theory), also called admissible recursion theory, is a branch of mathematical logic generalizing computability theory from the natural numbers to admissible ordinals.
Alpha Regio
Alpha Regio is a radar-bright tessera highland on Venus near 25S, 4E, about 1,300 km across, first identified by Earth-based radar in 1963, mapped by Magellan, and the descent target of NASA's DAVINCI mission.
Alpha Ridge
Alpha Ridge: large submarine volcanic high in the Amerasian Basin, Arctic Ocean, part of the Alpha-Mendeleev Ridge complex; Late Cretaceous oceanic plateau linked to HALIP magmatism, ~38 km thick crust, ages 82-90 Ma.
Alpha S. Yap
Alpha S. Yap, also known as Alpha Yap, is an Australian cell biologist and physician-scientist at the University of Queensland who studies cadherin cell adhesion.
Alpha School
Alpha School, founded 2014 in Austin, Texas by MacKenzie Price and Joe Liemandt, is an AI-driven private-school network (2 Hour Learning) with tuition of $10,000 to $75,000, expanding to about 50 campuses in 2026; outcomes lack independent verification.
Alpha Serpentis
Alpha Serpentis, traditionally known as Unukalhai, meaning "the neck of the serpent," is an orange giant star and the brightest in the constellation Serpens, about 74 light-years from Earth.
Alpha Sigma Phi (ΑΣΦ)
Alpha Sigma Phi (ΑΣΦ), Alpha Sig, an American social men's fraternity founded at Yale on December 6, 1845 by Manigault, Rhea, and Weiser; 10th oldest men's fraternity, headquartered in Carmel, Indiana, known for The Tomahawk magazine and its 2026 lawsuit against its own Rutgers members over hazing.
Alpha spectrometry
Alpha spectrometry is a radiometric analytical technique that identifies and quantifies alpha-emitting radionuclides such as uranium, plutonium, and radium by measuring the energies of their alpha particles.
Alpha Square Group
Alpha Square Group is a New York investment firm founded in May 2017 by ZiQiang Shaw and Lei Li, managing capital across private and public markets with about $1.6 billion in assets.
Alpha testing
Alpha testing is a controlled pre-release phase in which internal staff or selected users test a nearly complete software product at the developer's site, before beta testing.
Alpha tubulin
Alpha tubulin (α-tubulin), with beta tubulin, forms the αβ heterodimer that builds eukaryotic microtubules; ~55,000 Mr subunit, pI about 5.3, uniquely tyrosylated, encoded by isotype genes such as Tuba1a.
Alpha Ursae Majoris
Alpha Ursae Majoris, commonly called Dubhe, is an orange giant star of spectral type K0 III at the top of the Big Dipper's bowl, about 124 light-years from Earth.
alpha ventus
alpha ventus is Germany's first offshore wind farm, a 60 MW test field of twelve 5 MW turbines about 45 km north of Borkum in the North Sea.
Alpha wave
Alpha wave (alpha rhythm, Berger rhythm): 8–13 Hz EEG oscillation over posterior scalp during relaxed eyes-closed wakefulness, discovered by Hans Berger in 1924, blocked by eye opening and attention, interpreted as pulsed functional inhibition.
Alpha Wave Global
Alpha Wave Global, formerly Falcon Edge Capital, is an American asset manager founded in 2012 by Rick Gerson, managing about $29 billion in SpaceX, Anthropic, and OpenAI investments.
Alpha West Coal Project
The Alpha West Coal Project was a proposed underground thermal coal mine in Queensland's Galilee Basin, holding 1.8 billion tonnes of coal and never advancing past a concept study.
Alpha Xi Delta
Alpha Xi Delta (ΑΞΔ) is a women's sorority founded April 17, 1893, at Lombard College in Galesburg, Illinois, by ten women; an NPC member since 1904 with over 175,000 initiates, Quill badge, and Kindly Hearts philanthropy.
Alpha-(1,6)-fucosyltransferase
Alpha-(1,6)-fucosyltransferase (FUT8) is the sole mammalian enzyme adding core α1,6-fucose to N-glycans from GDP-fucose; essential for development, T cell activation, and afucosylated antibody manufacture.
Alpha-1 adrenergic receptor
Alpha-1 adrenergic receptor (α1-AR): family of seven-transmembrane Gq/11-coupled GPCRs (subtypes α1A, α1B, α1D) activated by adrenaline and noradrenaline, mediating vasoconstriction and smooth muscle contraction; targets of alpha-blockers for BPH and hypertension.
Alpha-1 antitrypsin
Alpha-1 antitrypsin (AAT, alpha-1 proteinase inhibitor, SERPINA1): a liver-made serpin inhibiting neutrophil elastase; inherited deficiency causes emphysema, COPD, and liver disease, treated by plasma-derived augmentation therapy.
Alpha-1 antitrypsin deficiency
Alpha-1 antitrypsin deficiency (AATD, Alpha-1, PiZZ) is a SERPINA1 inherited disorder causing early emphysema and liver disease; treated with IV augmentation therapy, with base-editing medicines like BEAM-302 in trials.