What Röd Adam/Red A means?

On the vertical stabilizer of the A32A Röd Adam, and in the camouflage pattern of the J21A-1 ‘Red A’, there is a big red letter A. Does anyone know what it means? Is it a reference to any squadron or wing?

11. jaktflygdivisionen – Wikipedia.
use google translate if you don’t know Swedish :)

Adam is military for the letter A in the same way the word “Alfa” is (as in Alfa, Bravo, Charlie, Delta… or Swedish Adam, Bertil, Cesar, David… ).
Röd is just the color red.