What are the little lightbulb and plus sings mean?

libra777 libra777
I see them on some topics posted but not others.. what do those little bulbs +numbers mean?

Thanks.
10/25/2012
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darthkitt3n darthkitt3n
It means that there has been additional posts on the topic since you last viewed it. The number tells you how many.
10/25/2012
libra777 libra777
Thanks!
10/26/2012
JennSenn JennSenn
Oh, really? Huh. Thought maybe it had to do with alerts or something
10/26/2012
Total posts: 4
Unique posters: 3