While I can't tell you what those letters mean, I can tell you that a mtDNA test will NOT give you your full ethnicity. That requires a different test.

I don't have a haplogroup letter either, and what I got is a string of Ts, Cs, As, and Gs.... But I _was_ told that my mtDNA matches a group of people living mostly in Cameroon today, and called the TIKAR people.

You should have gotten similar information from your mtDNA test.