Hi,

I never got the email. Can you send another as a test to make sure system is working ok?

Also, to answer your question:

The basic icons (new and old posts, as well as new and old posts with x number or replies or views) are explained at the bottom of any forumdisplay page that has threads on it, with two caveats:
-The addition of a black dot on any of these icons means you participated in it.
-The addition of a lock means the thread is closed.