Phase Angle: its three phase or 120@, having to do with the Hall sensors sensing circular motion and firing - most hub motors/controllers are three phase
Current: a primary measure of the current in amps which the controller is rated for, like all electrical equipment, since its job is to pass current from battery to motor - 7 amps is rather low comparatively
Brake Level: no idea, but since controllers take a sensor input from the brakes while braking so as to shut off current to the motor, perhaps the distance the lever must travel before the sensor triggers - looks like a measure in "cm"?
Controllers and motors must be matched to each other, so this information is being given to allow that. More advance controllers allow many of its control parameters to programmed. What are you trying to accomplish?