This blog post contains information about the fields in the Item Buckets section of the standard template in the Sitecore ASP.NET web Content Management System (CMS) and Experience Platform (XP). For more information about the standard template and topics mentioned in this blog post, see the links in the Resources section at the end of this page.
No clue what happened to alphabetic order of standard template field names here. *Maybe* these are ordered by something like expected frequency of use.
Not sure if it used to be different but Constants is in Sitecore.Buckets.Util not Utils. Thanks for the awesome reference pages!
@Jason: Thanks, you are right for at least the 8.1 builds, and I assume nothing has changed (I probably just typo'd and then cut-and-pasto'd). I have updated the text.