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 QML (Qt Modeling Language) is a user interface markup language. It is a declarative language (similar to CSS and JSON) for designing user interface–centric applications. Inline JavaScript code handles imperative aspects. It is associated wi ...

* 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 Saint Kitts and Nevis (), officially the Federation of Saint Christopher and Nevis, is an island country and microstate consisting of the two islands of Saint Kitts and Nevis, both located in the West Indies, in the Leeward Islands chain o ...

(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