Multiple realities
(covers information from several alternate timelines)

Diburnium is a metallic element with phaser-resistant qualities. (TOS: "That Which Survives", "By Any Other Name")

According to the Starfleet Medical Reference Manual, (p.17) the element diburnium, symbol Db, atomic weight 319, atomic number 122, was known to the ancients on the planet Vulcan.


An abandoned Kalandan outpost was built on an artificial planet composed primarily of a diburnium-osmium alloy. Attempts to cut through the surface with hand phasers had little effect. (TOS: "That Which Survives")

Kelvans used a material similar to diburnium, though much denser, in security applications. Prison door bars and a Kelvan field projector casing were fashioned from the substance. Spock doubted if phaser fire could disturb its molecular structure. (TOS: "By Any Other Name")

Diburnium levels were an element in the deflector shielding utilized by Starfleet Constitution-class starhips in the 2250s in the alternate reality. (Star Trek Into Darkness, display graphic [1])

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