[AMG]: `::` is the prefix or delimiter used to signify [namespace] qualification in variable and command names.  Any sequence of two or more consecutive colons is acceptable.

`::` is recognized as the name for the top-level namespace.  The true name is empty string, but `::` is the alias returned by commands such as [[[namespace current]]] to indicate the top-level namespace.

[AMG]: Preceding a fully qualified variable or command name with any number of `::`'s can be used as a hack to obtain a unique string that refers to said variable or command.  Just keep adding `::`'s until the string is unique, but no matter how many there are, it'll still be interpreted the same.

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