It depends on what it's referring to. It could be Front Side Bus, memory, or either bridge. You'll need to be more specific in what you're talking about. What it means by mhz is megahertz or million cycles per second (one hertz is 1 wavelength of ac electricity or basically one cycle). If it's your FSB, it's slow. (1066 MHz is 1.066 GHz and anything above that is standard today.) If it's memory speed, it's not that bad (at least the 1066 MHz isn't) but could be better. From the look of how you wrote it, it's probably the different speeds of RAM your computer can handle.
If you mean "how many models of motherboards" - thousands. If you mean "how many pieces of motherboards" - probably billions.
AO rating mean Adults Only
Means the person with the A rating is trustable
what is the power rating of energy
Do you mean what does it mean, acording to me, There is no GP rating anymore, it is not used anymore, besides it mean General Patronage.
what is the power rating of energy
There is no gdje rating for theatrical films in the United States.
The boat should have no lower horsepower that this rating.
rating pending means that the esrb is still deciding on the rating
rating pinding
RP stand for Rating Pending.
H speed rating is 130 mph maximum.