From Warhammer 40k - Lexicanum
Weavefield Projectors are force field technologies used by the Leagues of Votann.
Variants of this technology are used in everything from personal protection to ship shields. The system employs an energy-weaving technique called weavewërke which interlaces energy frequencies common to both refractor and conversion technology. This is interlinked with more exotic energies - such as magnetic repulsion fields and the resultant multi-spectral shield is maintained either in a personal cowl or protective dome to better shield entire squads of Kin. They are also worked into war engines and larger vehicles.
- 1: Codex: Leagues of Votann, pg. 33