AATC identification request

Wondering about AATC

I purchased some agar plates through a site. They labeled one of the plates as AATC. I reached out cause I couldn’t find any information on this genetic and wanted to know what the fuck that meant and didn’t really get much information. I’m wondering if anybody knows what that means. I recently fruited it, and the fruits are pretty thick and have wide drawn out width wise caps. I should’ve taken a picture but I’m terrible about that. Just hoping someone can clear up for me what the hell that variety is. TIA