Here's a more comprehensive list... I guessed on some of them based on the image name:
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_read.png)
- Unread announcement
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_read_locked.png)
- Read locked announcement
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_read_locked_mine.png)
- Read locked announcement you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_read_mine.png)
- Read Announcement you posted
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_unread.png)
- Announcement
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_unread_locked.png)
- Unread locked annoucement
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_unread_locked_mine.png)
- Unread locked announcement you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/announce_unread_mine.png)
- Uncread Announcment you posted
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_link.png)
- Link forum
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_read.png)
- Read topic
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_read_locked.png)
- Read locked forum
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_read_subforum.png)
- Forum with subforums (which have been read)
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_unread.png)
- Unread forum
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_unread_locked.png)
- Unfread locked forum
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/forum_unread_subforum.png)
- Forum with subforums (which are unread)
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_aim.png)
- Aim contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_email.png)
- Email contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_icq.png)
- ICQ contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_jabber.png)
- Jabber contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_msnm.png)
- MSN contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_www.png)
- Webpage contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_contact_yahoo.png)
- Yahoo contact icon
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_post_delete.png)
- Delete post
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_post_info.png)
- Post info
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_post_report.png)
- Report post
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_post_target.gif)
- Post target
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_post_target_unread.gif)
- Post target unread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_rate_bad.gif)
- Rate bad
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_rate_bad.png)
- Rate bad
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_rate_good.gif)
- Rate good
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_topic_attach.png)
- Attachment
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_topic_latest.gif)
- Go to last post in the thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_topic_newest.gif)
- - Go to last unread post in the thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_topic_reported.gif)
- Reported topic
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_topic_unapproved.gif)
- Unappproved topic
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/icon_user_warn.png)
- User warning
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_read.png)
- Read sticky thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_read_locked.png)
- Read locked sticky thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_read_locked_mine.png)
- Read locked sticky thread you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_read_mine.png)
- Read sticky thread you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_unread.png)
- Unread stick thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_unread.png)
- Sticky thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_unread_locked.png)
- Unread locked sticky thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_unread_locked_mine.png)
- Unread locked sticky thread you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/sticky_unread_mine.png)
- Unread sticky thread you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/subforum_read.gif)
- Subforum read
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/subforum_unread.gif)
- Subforum unread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_moved.png)
- Moved thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_read.png)
- Topic read
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_read_hot.png)
- Topic read hot
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_read_hot_mine.png)
- Topic read hot you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_read_locked.png)
- Locked thread
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_read_locked_mine.png)
- Locked thread you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_read_mine.png)
- Read topic that you have posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_unread.png)
- Unread topic
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_unread_hot.png)
- Unread hot topic
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_unread_hot_mine.png)
- Unread hot topic you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_unread_locked.png)
- Unread locked topic
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_unread_locked_mine.png)
- Unread locked topic you posted in
![Image](http://www.nwdiveclub.com/styles/ArrowTheme/imageset/topic_unread_mine.png)
- Unread topic that you have posted in
-Eric