The GNOME bug tracker, Bugzilla, may display emblems next to a bug's number on the bug list page.
Generally, emblems represent keywords. The heart emblem, , represents the gnome-love keyword (see GnomeLove).
The plaster / bandage emblem, , is a special case. It marks a bug as containing unreviewed patches. When all patches for the bug have been accepted or rejected, the will disappear.