Boom Supersonic Test Flights

So, what's the little frowning face on the lower panel in the center?

Never mind - I watched the video to the end and got my answer. The artificial horizon portion of this instrument failed, so they taped over that part of the display. The techs are unhappy, so they drew the frowning face on the tape with a silver sharpie. Good to see a sense of humor is allowed in this organization even though the work itself is very serious.
 
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