What does this declaration mean in visual C++?

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C++11

when I browse one demo project and saw this declaration in a header file:

static const int x;

not quite sure the meaning of it. so post here to check gurus here.

const int x; ==> x is a constant and can not be changed.

defined in the top of a header file, this static variable means it is a global variable and can be accessed/updated anywhere.

do I miss anything here?

What I have tried:

I understand the meaning of these declaration, but not sure what is the benefit of doing this way.