Put a line break in the app name
The name of the app that is displayed in BB10 under the ico is set from bar-descriptor.xml file from line
You could try \n in addition but overall I wouldn't expect that to be legal.
Maybe a silly question; but why would you want a linebreak in an app-name. I expect that to cause problems in various places.
Maybe there is a better way to solve the problem you have?
It's just in the text under the icon on the bb10 screen. There are other apps who's name is in 2 lines like "Blackberry World" else last letters are cut.
Add two spaces between the words you want on separate lines.