These are the meaning of the meters icons:

Topic with read messages.
Hot topic with read messages.
Topic with read messages. Mine post in topic.
Hot topic with read messages. Mine post in topic.
Topic with unread messages.
Hot topic with unread messages.
Topic with unread messages. Mine post in topic.
Hot Topic with unread messages. Mine post in topic.

Basically:

- A low meter activity indicates a topic with less than 1 page (10 posts).
- A high meter activity indicates a topic with more than 1 page.
- When the red LED is on it indicates that yourself is participating in the topic.
- White unlit meters indicate read topics.
- Yellow backlit meters indicate unread messages in the topic.

Other meters icons:
Sticky topic.
Topic moved.
Locked topic.
Announcement read.
Announcement unread.

Enjoy the meters!

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