@C (vs @D) just means it's a "real" session vs a designer session.
The various numbers after that indicate component indices. I believe : separates components on the same view, $ indicates an embedded view.
So in this case there are not that many embedded views as it shows. Does this mean it reaches deeper into other views that are in the embedded views? As shown in the image, this is all I have for this view.
Is there some sort of explanation for these values in a manual somewhere?
Based prior experiments, I think it is telling you that it came from something buried inside Divider Status (the first 0:0).
Unfortunately I found nothing to indicate the issue nor was I the originator of the view. I went through the entire tree, all embedded views, events and scripts.
There's nothing on this in the manual, to my knowledge. I would consider this an internal implementation detail that's mostly surfaced by coincidence in this MDC key.
I would concur with Phil that this is pointing at something inside Divider Status 
I would recommend getting in touch with our support department formally, they might have ready made reference material.
Turns out the issue was in 'Alert Title' .position.display shown in the tree but it didn't give an error in the code. The number [0] in C$0:0$0:0:0:1:0$0:2:0[0] represents the specific instance of a flex repeater that the 'Divider' view was being used in.
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L/R/T/B constants indicate a docked view, on left/right/top/bottom, respectively.
The bracket indexing is used in (at least) the tab container, possibly other places :shrug: