Which is the odd one out?

N is not the same upside down - you also need to flip it horizontally!  And one could argue that N is the only one with a diagonal segment.  I admit my proposed solution is also arbitrary, but so are all the others?  There must be something better!  Time to put on my thinking cap!

Edited on June 22, 2020, 9:54 pm

Posted by Kenny M on 2020-06-22 21:53:00