Library /sys$common/syshlp/dce$cdsbrowser.hlb Glossary, Group  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A group is a class of object entries that lets you
  associate, or manage as a group, a set of names that
  have something in common. A group maps a specific name
  (the group name) into a set of names, denoting the
  group members.

  The icon associated with groups in the Browser display
  is a hexagon with four addition signs within its dotted
  borders.