New with update?? Little Star..

[e5]

It means where you haven't read those little messages from Habbo underneather where your motto sits, or if you have a new one.

[Accipiter]

as sean said its when you get a sponsor message and you not on homepage. So e.g if your on the community page and theirs a sponsor message which hasn't been crossed off it will appear.

[100Thrones]

I believe it is if you have a message in your inbox or if there is a sponsered message. E.G Idea Agency Competition

[.ZzZzZ]

Yes, it's when something of the above happens while you are not on the habbo.xx/me site. It's been around at least v28 . You can close the topic :p
Once per 2 months you'll get a topic like this on a Habboforum about the little star next to your Habboname. :p If it's new 'nd stuff.

LOL you are the Moderator