Which of the following is used to indicate visibility in METAR reports?

The indication of visibility in METAR reports is represented by the abbreviation "VIS." This acronym is specifically defined in aviation meteorology as a standardized way to report visibility conditions at an airport. It succinctly conveys the distance over which an object can be clearly seen, which is crucial information for pilots when assessing flight conditions, particularly during takeoff and landing procedures.

The other options do not correspond to the officially recognized abbreviation used in METAR reports. While "VSBY," "VISB," and "VIZ" might seem plausible, they are not utilized in standard METAR formatting. The consistency of using "VIS" simplifies communication and ensures that all aviation professionals interpret visibility in the same manner, thereby enhancing safety and operational efficiency.