Agree, that's the other name for it, but I think that given-when-then is more focusing on the bdd & functional context of test in terms of the state transition of the SUT whereas AAA relates more to the structure of the test code itself. But still, I think the terms are interchangeable.
Miki Szeles
Everything related to test automation
Thanks for the article Radoslaw. I think there is a more popular name for this: Given-When-Then.