Letters that make non-U
o, n, u are letters that make 'non-U'
1 possible definitions for 'non-U'
Under this definition, non-u is an adjective and has the following properties:
'non-U' can be a region of United Kingdom, UK, U.K., Britain, United Kingdom of Great Britain and Northern Ireland, Great Britain
lower-class, low-class are similar to 'non-U'.