Xbox One
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On the Xbox One X circuit board, there is an etched engraving of Master Chief riding a scorpion.

Project Scorpio was the Xbox One X codename during development and in the Halo series, the tank Master Chief often drives is named The Scorpion.
Contributed by Kakariko Kid
A rare Xbox One console featuring Mother of Pearl engravings was released by Microsoft, with only one known to have been produced. It was given away as a prize as part of a competition by Microsoft Korea in 2016, with the winner being YouTuber BDC. Microsoft Korea had said that making the designs on the console were difficult to pull of due to dealing with modern materials.
Contributed by KnowledgeBase
The Xbox One sold over 1 million units on the first day of sale. Sony's PS4 also sold over 1 million units on its first day of launch.
Contributed by gamerofgames
During the announcement livestream unveiling the console and introducing many of its features, constant use of the Xbox Kinect sensor's vocal recognition was used. However, some users tuning in to watch the stream using their Xbox 360 were interrupted whenever voice commands were used, as their Kinects would recognize the commands coming from their TV speakers.
Contributed by Dazz