Tutonium

Supposedly, tutonium is a metal used in producing Transformer bodies.

Fiction

The Transformers cartoon

Megatron threatened to melt Swindle down for scrap tutonium if ever he'd do something stupid like selling his teammates again. B.O.T.

Games

Transformers Roleplaying Game

Grimlock’s superstructure incorporated tutonium casing. Technorganic Secrets