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 V04B Urine tests :''Empty group'' V04C Other diagnostic agents V04CA Tests for diabetes :V04CA01 Tolbutamide :V04CA02 Glucose V04CB Tests for fat absorption :V04CB01 Vitamin A concentrates V04CC Tests for bile duct patency :V04CC01 Sorbitol : ...

''Diagnostic agents'', a subgroup of the Anatomical Therapeutic Chemical Classification System * The V4 JavaScript engine for QML * V₄, one of six precordial leads in

electrocardiography Electrocardiography is the process of producing an electrocardiogram (ECG or EKG), a recording of the heart's electrical activity. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the hear ...

Other uses

* Visegrád Group, an alliance of four Central European states - Czech Republic, Hungary, Poland and Slovakia * ''

Rheinbote ''Rheinbote'' (''Rhine Messenger'', or V4) was a German short range ballistic rocket developed by Rheinmetall-Borsig at Berlin-Marienfelde during World War II. It was intended to replace, or at least supplement, large-bore artillery by providing f ...

'' or V-4, a German World War II four-stage missile * Saint Kitts & Nevis (ITU prefix) * Vieques Air Link (IATA airline code) * V4, a

grade (climbing) In rock climbing, mountaineering, and other climbing disciplines, climbers give a grade to a climbing route or boulder problem, intended to describe concisely the difficulty and danger of climbing it. Different types of climbing (such as sport ...

for difficulty of a boulder climbing route

Science and technology

Other uses

See also