The term "Angels" refers to what in aviation terminology?

In aviation terminology, the term "Angels" is commonly used to denote the height of friendly aircraft, specifically measured in thousands of feet above mean sea level. For example, when a pilot says an aircraft is at "Angels 20," it means that the aircraft is flying at an altitude of 20,000 feet. This term is widely understood in military and aviation communications, providing a clear and concise way for pilots and air traffic controllers to discuss altitude, ensuring effective communication and situational awareness.

The other options provided do not align with the standard definition of "Angels" in aviation. Altitude expressed above ground level, speed of aircraft, and distance to a target do not utilize this terminology, highlighting why the chosen answer is specifically correct in the context of aviation operations.