'Visual Studio unknown debug icon

I was debugging C# in Visual Studio 2017, and debugger stopped on an exception. Some static members can't initialize, and exception is raised in member's class constructor. In Auto window I saw this icon that I have never seen before:

enter image description here

Blue box stands for class member. What does squared number one stand for?

I went through the Visual Studio Image Library 2017, a pdf file within a zip file, but couldn't find this one.



Solution 1:[1]

That means "static member field". The "1" apparently means "has only one instance".

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Solution Source
Solution 1 PMF