Titanium
From Tardis Wiki, the free Doctor Who reference
Titanium was an element and a strong metal.
The vault of the bank on Centuria was made of titanium. (COMIC: Time of the Cybermen)
The metal used in Vondraxian orbs shared properties with titanium and zinc, but was neither. (PROSE: Trace Memory)
SERVEYOUinc used titanium vault-like doors to protect their most sensitive research at the United System Research Base. (COMIC: The Sound of Our Voices)
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