What does 'using ..SomeMudule' mean?

General Usage
1

What does the two dots mean? I guess it is path relevant.

2

It relates to nested modules. The two dots refer to a sibling module:

julia> module A      
       module B      
        f() = 1     
       end           
       module C      
        using ..B: f 
        g() = f()  
       end           
       end           
Main.A               
                     
julia> Main.A.C.g() 
1
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