Translation: I got Spectral Armor on this Tyrannosaurus. No other dinosaur is stronger than it.
In the arcade, Gigas is the only Tyrannosaurus which is signed Rock (even otheraltered Tyrannosaurus are signed Paper).
Gigas's name likely came from the species "Manospondylus gigas", the name given to a theropod that turned out to be the same as Tyrannosaurus, but had been named earlier, meaning "M. gigas" should have had priority over T. rex. However, due to the incomplete nature of its fossils, and the fact that it was never mentioned in scientific documents since before 1899, "M. gigas" was deemed invalid.