Is AB an acronym?
yes it is short for Alberta a province in Canada and may be for other things as well
"Ab" is not a Swedish word. "AB", however, has two meanings: 1) Acronym for "aktiebolag", similar to "ltd." in English. 2) The second best grade in the grading system used in Swedish schools 1897/1905-1962. (Source: Nationalencyklopedin, http://www.ne.se/lang/bety, password protected; Nordisk Familjebok, vol. 3, 1905, http://runeberg.org/nfbc/0110.html)