Here is the complete overview of Nimbuzz 3.3.1 for Nokia Symbian phones:
Three new icons added: Recent Chats, N-World and Groupchat
Block contacts that annoy you
New “Notifiable” icon – the green half moon
Change your password from the inside the app
30% faster login
Redesigned Home Screen for fast access to your favorite features
The icon with a half green moon stands for Notifiable and it will appear only next to your Nimbuzz contacts that closed the Nimbuzz app but can still receive Ping notifications on the Java and Symbian phones. So when you see this icon remember that we will push your messages to your friend but it might take a while for them to see it since their app is closed.