Would you like to call a servant, but too lazy to shout or have forgotten the name? Bell Handle bell - that's the best solution :)!
And yes, it looks like the bell of the "Big Bang."
Application can sound like a bell - just press a button or shake the phone. To stop the bell ringing, too, will have to press the button or shake the phone. The opportunity to ring the bell for free, without registration and sms - do not miss your chance!