I ran across this answer posted on a question so simple and direct the title says it all:
What is the D-shaped icon next to my USB-C port?
I've tried to capture the essence of the answer in the following quotes:
let me elaborate a little on why it's [the D-shaped icon] necessary. The USB C connector is the biggest mess I have seen in computing connectors.
Here are a few things it [the USB C port?] might or not be capable of...
be very glad you have at least some indication of what your port is capable of. You do not always have that luxury:
It's literally anyone's guess what are these ports capable of.
They really, really should have provided some way to clarify this mess but they didn't.
USB C is a brave new world.
Seriously? How does this answer the question of what the D-shaped icon is?
The only thing between me an a 1000 lb. NAA flag is the fact this post currently has 140 net up votes and had to have been seen by a lot of experienced Super Users given that it was posted on a Hot Network Question.