Question: sort command by symbol address

Ok this is an extract from the help page, i have no idea what this means nor how a procedural function that orders a finite list of objects in a certain way could possibly be described as "non deterministic", so i really really need someone to help me here please, most confusing part is in bold:

sort(L, F)
 

If F is the symbol address, then the elements are sorted by address (a non-deterministic run-time specific property of the underlying data structure)
 

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