http://www.techradar.com/news/every-xbox-one-x-has-a-mini-master-chief-hidden-inside

You might recall that the Xbox One X console was once known as "Project Scorpio" while in development, and Microsoft has paid homage to that legacy with a little surprise hidden inside each unit.

Specifically, it's a little drawing of Master Chief from Microsoft's acclaimed Halo series riding a scorpion that's etched directly into the circuit board. It also makes for a humorous visual pun that references "Scorpion" tanks the Chief sometimes drives.