ABBREVIATIONS AND THEIR FULL FORMS IN GST ACT, 2017

1) AA             Appellate Authority

2) AAAR        Appellate Authority for Advance Ruling

3) AAR           Authority for Advance Ruling

4) ARN           Application Reference Number

Read more at http://akvassociate.com/blog/2017/04/26/abbreviations-and-their-full-forms-in-gst-act-2017/