Gil's correct...
On a fixed pitch prop installation, the static RPM is the max the engine will turn while you're stationary. As you accelerate, the oncoming rush of air allows the prop to turn faster and faster, until you eventually get to cruise flight. If your prop is optimized for cruise, you should see redline RPMs or slightly higher for this reason. Our -6A with 180 Lyc and a three bladed Catto, optimized for max speed only turned 2200 static but went to around 2750 wide open for 201 MPH true!
A few more abbreviations are shown in a new thread for you newer RV guys.
Best,