WiMax is your 4G receiver/transmitter (mobile data)
PRI, it has something to do with how your phone communicates with the tower. some people report faster 3g speeds with different PRI's. there is much debate as to how important it actually is.
NV is your non-volatile memory. stores information. not sure what information it stores on an EVO exactly.
of course i could be totally wrong or making up these definitions