I'm still going with the definition they left off, the most obvious one:
version 2.
Or could be this one:
Velocity 2, the minimum speed needed for an aircraft to lift-off
V2
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Look up V2 or V-2 in Wiktionary, the free dictionary.
V2, or similar, may refer to:
Contents
1 Science
2 Technology
3 Entertainment
4 Other
Science
V2 receptor, a protein that acts as receptor for arginine vasopressin
Velocity 2, the minimum speed needed for an aircraft to lift-off
Visual cortex#V2 area
V2, one of six precordial leads in electrocardiography
Maxillary nerve, (V2), the second division of the trigeminal nerve
Parameter describing the azimuthal anisotropy in heavy-ion collisions
V2 word order, the verb-second word order of Germanic languages and other languages
Voyager 2
Technology
V2 speed, aircraft takeoff safety speed
Dragon V2, a commercial spacecraft being developed for astronaut crew transport
Hanlin eReader V2, an ebook reader
LNER Class V2, a British railway locomotive
V-2 rocket, an early ballistic missile used in World War II
V-2 trailer, a mobile Ground-controlled approach radar system element first used during World War II containing the system's radar and communications sets
ARA Veinticinco de Mayo (V-2), an aircraft carrier in the Argentine Navy from 1969 to 1997
Culver V-2, a two-seat cabin monoplane
Curtiss V-2, a 12-cylinder Vee liquid-cooled aircraft engine
Fokker V.2, a German fighter aircraft prototype
Diesel model V-2, a twelve-cylinder Soviet tank engine, used in the T-34
Soviet submarine V-2
USS V-2, a 1924 Barracuda-class submarine of the United States Navy
V-twin engine
V.2, a telephone communications standard of the ITU-T
V2, a brand of electronic cigarettes made by VMR Products
MIT EAD Airframe Version 2, the first ion wind airplane
Entertainment
V2 Records, a record label
V2: Vertical Velocity, a roller coaster at Six Flags Discovery Kingdom
V2.fi, a Finnish gaming - and entertainment-oriented website
V2: Dead Angel, a 2007 Finnish film
V2 (album), second studio album (1978) by punk rock band the Vibrators
V2 (band), punk rock band formed in Manchester in 1977
V-2 Schneider, a largely instrumental piece written by David Bowie in 1977 for the album Heroes
"V2" (song), single by That Petrol Emotion
Byte (service), a short-form video hosting service formerly known as "v2"
Other
Vatican II or Second Vatican Council (1962 - 1965)
Antigua & Barbuda, International Telecommunications Union prefix
V2 Institute for the Unstable Media, a Rotterdam-based new media research institute