VNO is Maximum Structural Cruising Speed per definition in CFR FAR Part
1. If you were to ask what is VNO? Why do some Pilots constantly
believe its Normal Operation Speed. The Green arc is the normal
operation. The yellow arc is cautionary range. The white arc is the
range in which we can use flaps. The top of the white is VFE. The
bottom of the white arc is VS0. Just like the Bottom of the green is
VS1. Of course VNE never-exceed speed is the tiny red arc and we
shouldn't go there!

So tell me what is the definition of VNO?

Cjamairway