These cover most of the icons... enough to get the idea.

- Announcement

- Sticky read topic

- Sticky unread topic

- Read topic

- Unread topic

- Read topic that you have posted in

- Unread topic that you have posted in

- Hot topic

- Locked topic

- Moved topic

- Forum with subforums (which have been read)

- Forum with subforums (which are unread)

- Link forum