I can’t find any documentation on what the various icons and icons mean in VS2015. Using the debugger, I ran into incomprehensible notation when checking the properties of a model. This is when during debugging you can hover over an object and the environment displays a window with the fields of the object and the values that these fields contain.
Actually, what the wrench means, I understood - these are the available properties, but what kind of forgive the "blue box" with the "stop sign" I did not understand. The only thing I can not access to them.


