Is there a standard name for this tree structure?

[Lie Ryan]

On 04/07/10 14:18, Steven D'Aprano wrote:
> I could have used None, or "root", or "this is a magic value that 
> probably won't clash with an entry in the tree", or -1 as a sentinel 
> instead, but they all risk accidental clashes with tree entries.

Especially when you want to consider the possibility of inserting the
data structure inside the data structure itself.