WAR (Web application ARchive)
From Wikipedia:
A WAR file (or Web application ARchive1) is a JAR file used to distribute a collection of JavaServer Pages, Java Servlets, Java classes, XML files, tag libraries, static Web pages (HTML and related files) and other resources that together constitute a Web application.
Nuxeo WAR concept
Nuxeo provides a static WAR packaging for deployments: see Deploying as a Standard Static WAR and NuxeoCtl "pack" command.