All articles starting with a number or symbol

2,5-Dimethoxy-4-methylamphetamine

2,5-Dimethoxy-4-methylamphetamine (DOM), also known as STP, for Serenity, Tranquility and Peace, is a synthetic psychedelic amphetamine invented by Alexander Shulgin in 1963, appearing as an LSD substitute in 1967 and now a US Schedule I drug.

2,5-Furandicarboxylic acid

2,5-Furandicarboxylic acid (FDCA) is an organic compound made mainly by oxidizing the biomass molecule HMF, serving as a bio-based replacement for terephthalic acid in polyester production such as PEF.

2,6-Diaminopyridine

2,6-Diaminopyridine (pyridine-2,6-diamine, CAS 141-86-6) is an aromatic heterocyclic compound with amino groups flanking the nitrogen of a pyridine ring, used in azo dyes and oxidative hair dyes.

2,6-Xylenol

2,6-Xylenol, also called 2,6-dimethylphenol, is a phenolic compound with formula C₈H₁₀O, a colorless crystalline solid used as the monomer for polyphenylene oxide (PPO) and as a flavoring substance.

2,8-Dihydroxyadenine

2,8-Dihydroxyadenine is a poorly soluble oxopurine, formed from adenine and excreted in urine, that accumulates in APRT deficiency and causes radiolucent kidney stones and crystal nephropathy, preventable with allopurinol.

2:00 P.M. (The Pitt season 1)

"2:00 P.M." is the eighth episode of The Pitt season 1 (HBO Max, aired February 20, 2025), written by Joe Sachs, directed by Amanda Marsalis. It features the Freedom House ambulance storyline, a child drowning, and Nick Bradley's honor walk; Emmy-nominated for writing.

2:00 P.M. (The Pitt season 2)

"2:00 P.M." is episode 8 of The Pitt season 2, an HBO Max medical drama hour set at 2:31 p.m. on July 4, directed by John Cameron, written by Joe Sachs, depicting an analog ER after a cyberattack shutdown, aired February 26, 2026.

2:22 (2017 film)

2:22 is a 2017 mystery thriller directed by Paul Currie, starring Michiel Huisman, Teresa Palmer, and Sam Reid, about an air traffic controller suspended after a near-collision.

2. Bundesliga

2. Bundesliga (Bundesliga 2), Germany's second football division run by the DFL since 1974; 18 clubs, two automatic promotion places plus a play-off, record second-tier attendances, Schalke champions 2025/26.

2. klasse steinfeld

2. Klasse Steinfeld, a lower-tier men's football league of the Niederösterreichischer Fußball-Verband in Lower Austria, around Wiener Neustadt; 12-13 clubs, promotion to the 1. Klasse.

2. lig play offs

2. Lig play offs (TFF 2. Lig play-offları): promotion playoffs of Turkey's third football tier. Teams ranked 2nd-5th in the White and Red groups play off for two promotion places to TFF 1. Lig under the 2025-26 format.

2.0 (film)

2.0, also known as Enthiran 2.0, is a 2018 Indian Tamil-language science fiction action film directed by Shankar and starring Rajinikanth as Dr. Vaseegaran and his robot Chitti.

2.0 (song)

2.0 is a 2026 trap song by BTS, track 5 on the album ARIRANG, produced by Mike WiLL Made-It and Pluss, written partly by RM, j-hope, V, Jung Kook, and SUGA, with an Oldboy-homage music video.

2.4 GHz band

The 2.4 GHz band is license-exempt radio spectrum from 2400 to 2483.5 MHz, shared by Wi-Fi, Bluetooth, Zigbee, Thread, and microwave ovens under FCC and ITU ISM rules.

2.5D

2.5D, or two-and-a-half-dimensional, is a video game term for 2D graphics that simulate 3D, or 3D games whose gameplay stays on a 2D plane, as in DOOM and Klonoa.

Sep 19, 2026

2.5D idol (music)

A 2.5D idol (2.5次元アイドル) is a Japanese performing act where real performers embody fictional characters from anime, manga, and games, a category traced to the 2003 Prince of Tennis musical.

2.5D packaging

2.5D packaging is an advanced semiconductor packaging approach that places multiple dies side by side on a shared interposer or embedded bridge, rather than stacking them vertically.

2.5GBASE-T and 5GBASE-T

2.5GBASE-T and 5GBASE-T, also called NBASE-T and Multi-Gig, are Ethernet standards from IEEE 802.3bz-2016 that run at 2.5 and 5 Gb/s over existing Cat5e and Cat6 cabling, mainly for Wi-Fi access point backhaul.

2'-Fucosyllactose

2'-Fucosyllactose (2'-FL) is a trisaccharide sugar, the most abundant oligosaccharide in the milk of most lactating women, manufactured by fermentation and added to infant formula as a prebiotic fiber.

2',3'-cyclic-nucleotide 3'-phosphodiesterase

2',3'-cyclic-nucleotide 3'-phosphodiesterase (CNPase, CNP, E.C. 3.1.4.37) is a 2H phosphoesterase making up 4% of CNS myelin protein, hydrolyzing 2',3'-cyclic nucleotides to 2'-nucleotides; its in vivo substrate remains unknown.

2',7'-Dichlorofluorescein

2',7'-Dichlorofluorescein (DCF) is a chlorinated derivative of the dye fluorescein, used as an adsorption indicator in chloride titrations, as the fluorescent product of the DCFH₂-DA oxidative stress assay, and in fluorescent probes.

2/1 game forcing

2/1 game forcing (2/1 GF), a bridge bidding system derived from Standard American: a non-jump new-suit two-level response by an unpassed responder forces to game, requiring 13+ points, with a forcing 1NT response.

Oct 3, 2026

2/Duo

2/Duo (2/デュオ, 2/Dyuo) is a 1997 Japanese improvised drama, Suwa Nobuhiro's feature debut, about a couple played by Yu Eri and Nishijima Hidetoshi; it won the NETPAC award at Rotterdam 1997.

2+2 Ministerial Dialogue

2+2 Ministerial Dialogue: a diplomatic format pairing the foreign and defense ministers of two countries. Known from US-India (since September 2018), Japan-US SCC, Japan-India, Japan-Australia, India-Russia, and newer China-Indonesia and China-Cambodia mechanisms.

20 (number)

20 (twenty, Roman numeral XX) is the natural number following 19 and preceding 21, the atomic number of calcium and the base of vigesimal counting systems used by the Maya.

Oct 22, 2026

20 February Movement

20 February Movement (حركة 20 فبراير), Morocco's Arab Spring protest movement of 2011, a leaderless youth coalition demanding reform; triggered the July 1, 2011 constitutional referendum recognizing Tamazight.

20 Feet from Stardom

20 Feet from Stardom is Morgan Neville's 2013 Oscar-winning documentary about backup singers Darlene Love, Merry Clayton, Lisa Fischer, and others, covering their gospel roots, uncredited contributions, and stalled solo careers.

20 Fenchurch Street

20 Fenchurch Street, known as the Walkie-Talkie, is a 160-meter skyscraper in the City of London designed by Rafael Viñoly and completed in 2014, topped by the public Sky Garden.

20 July plot

The 20 July plot, also called Operation Valkyrie, was the failed 1944 attempt by Stauffenberg and other German resistance figures to assassinate Hitler with a briefcase bomb at the Wolfsschanze and stage a coup; it failed, and about 4,980 people were executed.