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I have been looking for a summary of the meanings of the different icons that are displayed to the left of threads some I can work out,one next to a sent pm in my sent folder has me stumped.
There is a triangle with an exclamation point in it below the normal circle with text.
Edit
Found this after some more searching
http://www.moosburg.org/design/forum/pr ... ndeng.html" target="_blank

Cool! I have wondered about those before as well.

The icons to the left of discussion threads tell you if a discussion thread has a new post since your last visit (you need to be logged in for this to work) and shows activity or popularity. See following image below.

I am no longer stumped the warning icon was in my sent folder because when I typed the subject line my big finger must of touched the warning icon in the row above.
Thank you Rick for your graphic and thanks to Wayne for checking.
The graphic link in my op really helps when mining old threads.