What does 10-20 stand for?

10-20 stands for "Advise to location"

How to abbreviate "Advise to location"?

"Advise to location" can be abbreviated as 10-20

What is the meaning of 10-20 abbreviation?

The meaning of 10-20 abbreviation is "Advise to location"

What does 10-20 mean?

10-20 as abbreviation means "Advise to location"