Board Thread:Question and Answer/@comment-27036342-20151108185737/@comment-25751901-20151108190436

AD = alliance duel. This word is used to refer to the very old form of Alliance ultimate battle. There used to be Alliance Duel (AD; about early 2014), then Alliance Battle (AB; about early to late 2014), then now Alliance Ultimate Battle (AUB; late 2014 till now).