What does R stand for?

R stands for "(as a prefix:) restricted airspace"

How to abbreviate "(as a prefix:) restricted airspace"?

"(as a prefix:) restricted airspace" can be abbreviated as R

What is the meaning of R abbreviation?

The meaning of R abbreviation is "(as a prefix:) restricted airspace"

What does R mean?

R as abbreviation means "(as a prefix:) restricted airspace"