What character to use to put an item at the end of an alphabetic list?

I often prepend '_____' to the item I want in first position.
Is there some sort of magical character I could use to put an item at the end of the list?

Something more elegant than "z_item".

Example of this issue for a list of files in Windows Explorer :

Another example from Outlook 2010

Actual folder structure :

• _custom folder1
• _custom folder2
• Inbox
• Sent box
• Spam folder

Expected folder structure :

• Inbox
• Sent box
• Spam folder
• [?]custom folder1
• [?]custom folder2

What caracter could I use?

I found this thread while wanting folders that sort after Z in Finder on Mac OSX. After several false paths and trial and error, here's what I found:

Characters that sort after Z in Finder (in sort-order)

• z Lower case Z
• ι Greek letter
• Ι Greek letter, capital version of above character, not an "I")
• Ω Omega
• 一 Japanese Character? (Thanks, Jam)
• 口 Japanese character? (Thanks, Jam)
• 末 Japanese character "End" (Thanks, Jam)
•  (a private use character) (Thanks, Peter O.)

These are characters others here and in other places on the web, mentioned sort after Z, but that I found DO NOT sort at the end, at least when sorting by name in Finder on Mac:

† ∆ ~ - ſ [ ø ￭ |