V4
V4 or V-4 may refer to:
Science and technology
- LNER Class V4, a British steam locomotive
- V4 engine, a V engine with four cylinders in two banks of two cylinders
- Visual area V4, in the visual cortex
- Klein four-group, in mathematics
- V.4, an ITU-T recommendation for data transmission
- ATC code V04 Diagnostic agents, a subgroup of the Anatomical Therapeutic Chemical Classification System
Other
- Rheinbote V-4, a German World War II four-stage missile
- Saint Kitts & Nevis, by ITU prefix
- Visegrád group, a political grouping of central European countries
- Vieques Air Link, by IATA airline code
- Grade (climbing), a grade for difficulty of a boulder climbing route
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