Multi-adaptive shielding was a deflector shield stealth technology developed by Erin and Magnus Hansen in 2353, for use in keeping their vessel, the USS Raven, virtually invisible to Borg sensors during their field study of the Collective.
After tracking a Borg cube at close range for nearly three years, the Hansens encountered a subspace particle storm which caused their shielding to go offline for 13.2 seconds, during which time the Borg were able to detect them. Considering the Raven a threat, they pursued the ship and ultimately assimilated the Hansens.
In 2389, the crew of the USS Black Hawk adapted this technology for use on the USS Mississippi in order to sneak through a well-armed minefield.