What are the little symbols to the left of the postings on the forums? Can you tell me what they signify?

Every folder and thread in the forums has an icon next to it. These icons provide additional information about the item, which can be useful to site members.  The key below provides a description of each icons you will encounter in the forums:

• Green folder means the folder contains posts you have not read (see also the Topics column, which will have a hyperlink in it with "# new" posts).
• Red folder means you have read all the posts in that particular folder (there will be no extra hyperlink in the Topics column).
• Thumbtack icon represents a "sticky" thread, an important thread placed at the top of the list by site administrators.
• Star icon represents a new thread you have not read.
• Multiple-bubble icon represents a thread which is "hot" (lots of recent posts).
• Multiple-bubble + star icon represents a thread which is "hot" and you have not read.
• Lock icon represents a thread that has been locked from further comments.
• Single-bubble icon represents a basic forum thread with no special designation.