Do you use "at" in acronyms?

Generally lesser words like "at" or "the".. I think they're called articles but I'm not sure.. Are not used in acronyms. However you can use them if you really want to.. Like if making the word At part of the acronym was necessary to make it form a nice sounding/catchy acronym or a real word then you can if you want. So it can be AMB or AMAB but most likely will be AMB.