Some people I know from Saudi Arabia refer to it as Saudi, so maybe thats the better word? I've never heard anyone call it Arabia.
"Arabia" is the name of the entire peninsula. There's half a dozen countries there.
KSA works too and matches UAE pattern.
I have heard lots of people who refer to it as Saudi and that would be a reasonable way to do it IMO.
Yes. Say Saudi.
"Arabia" is the name of the entire peninsula. There's half a dozen countries there.