What does VFR stand for in aviation terminology?

VFR stands for Visual Flight Rules, which is a set of regulations under which a pilot operates an aircraft in weather conditions generally clear enough to allow the pilot to see where they're going. These rules are designed for pilots who can navigate and control the aircraft by visual reference to the ground and other landmarks, rather than relying solely on instruments.

In practice, flying under VFR means that the pilot can maintain adequate visibility and spatial orientation to avoid obstacles and other traffic in the air. This term is crucial in differentiating from IFR, or Instrument Flight Rules, which require pilots to fly primarily by reference to instruments in the cockpit, typically in situations where visibility is poor or when flying in controlled airspace.

The other options do not accurately reflect the correct terminology used in aviation, highlighting the importance of understanding standardized aviation phrases for effective communication and safety.