This is the 760th most frequent Swedish word.
ab
"Ab" is the abbreviation for "aktiebolag," which means "limited company" or "corporation" in English.
In this sentence, 'AB' ('Aktiebolag') denotes a type of business entity equivalent to 'Corporation' or 'Limited'.
AB Volvo är ett svenskt multinationellt företag.
AB Volvo is a Swedish multinational company.
Here, 'AB' indicates the business structure of 'AB Träning', implying it is organized as a corporation.
Jag har ett gymkort på AB Träning.
I have a gym membership at AB Training.
In this usage, 'AB' is part of the official designation of the company, showing its status as a corporation.