R2 and R3 have values listed as "NM". What does that mean?
I think they are 'pads' that can be cut. They are not actually resistors.
http://forum.arduino.cc/index.php?topic=121500.0
However, I can't find those 'pads' on the Leonardo. Perhaps they are resistors with a value of zero ohm.
NM = not mounted, at a guess.
Caltoa:
I think they are 'pads' that can be cut. They are not actually resistors.
Help a Newbie Out: Obtaining a list of parts for Leonardo - Project Guidance - Arduino Forum
However, I can't find those 'pads' on the Leonardo. Perhaps they are resistors with a value of zero ohm.
I'm thinking that they're there in the schematic just to mate the AGND line with the GND line (R2) or UGND to GND (R3). Logically the connections are all just "GND" but the traces need to be handled differently in the physical layout to keep noise low. Pretty clever way to do that, really.