If it's an "unapproved draft" it is not a standard yet, so none of them should have "Std" included. I'm sure many do though -- the working groups work on revisions based on the published version and are not necessarily aware of these subtleties.
i.e. "Unapproved Std" or "Unapproved Draft Std" should not have "Std".
@mico we just received clarification from IEEE:
i.e. "Unapproved Std" or "Unapproved Draft Std" should not have "Std".
Originally posted by @ronaldtse in https://github.com/metanorma/pubid-ieee/issues/11#issuecomment-1452086797