Nintendium

From Nintendo +‎ -ium (“suffix for naming new elements”).

Nintendium (uncountable)

1. (humorous) A fictional material credited for the durability of several Nintendo products.
   • 2015 August 3, u/MistaSnowman (username), Hey /r/nintendo, what's your best "Nintendium" story?, r/nintendo (Reddit), archived from the original on 26 May 2020, accessed 26 May 2020:

     [W]hatever they make Nintendo systems out of ("Nintendium," as it's come to be known) seems to be able to withstand anything.

   • 2016, Will Greenwald, Nintendo Switch Looks Really Promising, Here’s How They Might Screw It Up, Geek.com:

     The Joy-Cons need to be comfortable, light, and feel like they’re made of Nintendium (the mysterious alloys Nintendo used in the original NES controller, seemingly related to Gundanium).

   • 2017, Cory Arnold, Hands-on: Nintendo Switch won't blow you away but will satisfy core gamers, Destructoid:

     All components feel very sturdy and of solid construction (Nintendium still being used!).