V4D stands for Volunteerism for Development
V4C stands for Vigil for Civility (blog)
V4ADDR stands for IPv4 Address of a node
V4A stands for Voice for Animals (Canadian animal rights organization)
V4 stands for Novell Netware Version 4
V3V stands for ventral third ventricle
V3R stands for V3 Pituitary Receptor
V3PN stands for Voice and Video Virtual Private Network (Cisco)
V3I stands for Vision 3 International Ltd. (Korea)
V3BP stands for V3 Loop-Binding Protein