Who is "the" angel of the Lord who Alma the Younger saw? Mosiah 27:11

Who is "the" angel of the Lord who Alma the Younger saw? Mosiah 27:11

Alma the Younger sees an angel. Twice. Some people are really lucky, I guess? Humph.

Answer:
The same angel appeared to Alma both times. We don't know his name.

Also, I'm not the only one asking this question, nor coming to the conclusion that I guess it doesn't matter.