Android supports 3 types of Application Menus. Those are
1. Options Menu
2. Context Menu
3. Sub Menu
Options Menu :
It is a collection of Menu items which will appear when the user invokes "Menu" button on the Android device.
If the item count is <= 6 then all those are displayed properly.
Context Menu :
Context Menu is the menu which is similar to right click on your desktop computer. It means it will raise when the user tap or click on a list item it will display a menu.
Sub Menu :
It is also a list of menu item that will appear if the user selects item in the menu item contains a nested list of menu.
For example item 3 is having a Sub Menu.
If you want more detail about Menus go through the following link