AD Recycle Bin is a well-know Windows group. Active Directory Object Recovery (or Recycle Bin) is a feature added in Server 2008 to allow administrators to recover deleted items just like the recycle bin does for files. The linked article gives a PowerShell command to query all of the deleted objects within a domain:

Get-ADObject -filter 'isDeleted -eq $true -and name -ne "Deleted Objects"' -includeDeletedObjects

Get-ADObject -filter { SAMAccountName -eq "TempAdmin" } -includeDeletedObjects -property *