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Metaphysic shields were a deflector shielding technology utilized by Starfleet in the 2250s in the alternate reality.

The Constitution class[!] was equipped with metaphysic shields in 2259 as a part of its defensive array. This deflector shielding was divided into bow and aft deflectors that maintained the protective diburnium-osmium levels that protected the ship from threats, such as phaser fire from enemy targets. (Star Trek Into Darkness, display graphic [1])

According to Mr. Scott's Guide to the Enterprise (page 14), the deflector shields of the refit-Constitution-class starship in the prime universe were also utilizing a similar technology, while only the defense fields protecting the top decks were traditional force fields. The main shield grid was a massive replicator system, projecting an invisible hull layer, molecularly identical to the diburnium-osmium alloy used to build the Kalandan outpost seen in the episode TOS: "That Which Survives".
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