GIG is a common aerospace and defense acronym that stands for: global information grid.
The GIG is the globally interconnected, end-to-end set of information capabilities for collecting, processing, storing, disseminating, and managing information on demand to warfighters, policy makers, and support personnel. The GIG includes owned and leased communications and computing systems and services, software (including applications), data, security services, other associated services, and National Security Systems. (Source: National Security Agency, NSA)