These are iconic and would work even at a very
small size. I am very supportive of this approach.
One suggestion would be to make the
admin "base" be at the same line as the other 2. All should
fit into the same space.
In terms putting this into Moodle long term, my thought is to add
a config setting. Extend what is done for the terms used
for "Teacher/Teachers" and "Student/Students",
adding in a place for this icon. Same config style used at
the top level for "Admin/Admins".
In terms of some immediate way to get this in, I'll let
others take that one