What does an offer like ABB/AAB mean?

What does it mean if the university specifies you need ABB/AAB? Which one do you need in this case and what is the difference?

My friend got a similar offer, two grades separated by "/" as a requirement for a foreign qualification.

Thanks

That doesn't seem to make logical sense. Is this in a formal offer through Ucas, or just the typical requirements e.g. on the department's webpage?

Thanks for the responses. It is the text of the official condition.

If that's actually what he's been given as an offer, the uni shouldn't have done that. Offers are meant to be clear an unambiguous. It would be worth contacting them to find out what exactly they mean and pointing out that the offer obviously has two possible interpretations.

Now that is an excellent point. The thing is, we are hesitant to contact the uni because we are talking about a small EU country's qualification, which the uni might not fully understand - and it could be to my friend's advantage.

It might happen that once my friend submits her results, she can point out the somewhat ambiguous condition and say, "hi guys, I met your condition. thanks see you in september". She is likely to get the first condition but won't achieve the second condition. It happened before even to me that universities said they require different grades at different times we contacted them probably because they are unsure about this qualification type. I understand that it is the applicant's responsibility to fully understand the conditions and ensure they are clear but couldn't this work to my friends advantage in this case? if she asks them and they say, oh, actually let us correct it and say we require the higher grade, she will never get in...