What is this green symbol on the touch bar? I've seen this green symbol on the touch bar of a MacBook Pro, as shown in the image below. I have no idea what it could mean or what it signifies.

Some details about it:


It only comes on when the touch bar is "asleep", in that there isn't anything else displayed on the touch bar. Activating the touch bar makes it go away.
It appears to be three toned.
I cannot interact with it. Touching it does nothing.
Sometimes it flashes. The rate of flashing is variable and doesn't seem tied to anything sensible that I can find.
It is right next to the power button at the end of the touch bar.


Some details about the computer:


13-inch, 2018 MacbookPro
Running macOS Catalina, 10.15.3


Any ideas?
This is no icon or a symbol but rather a hardware error.

The greeninsh flashing rectangle next to the TouchID button has been recognized as sign of a faulty Touch Bar in several cases:

Video: 


Guide to AppleCare for Mac &amp; Overnight Shipping (title is misleading!)  


Online Forums: 


Flashing Touch Bar rectangle (text only)
2017 MBP touchbar flashing issues (text, the pics and videos linked in the thread don't work for me)
little white box on touch bar when macbook pro is asleep. anyone know what it is? (the issue was reinterpreted as a "feature": It’s your sleep notification light)