Weird Options Menu -button In Navigation Bar (android 4.0)

What is this options menu button and how I can get rid of it? See image

Solution 1:

Its the legacy button. Newer phones don't have a menu button but obviously older apps still want to use it. This is the soft button that is used instead of the old hard button

You can read more about it here

http://android-developers.blogspot.de/2012/01/say-goodbye-to-menu-button.html

Solution 2:

That is the default "more options" button.