I have seen the term NPU used in reference to neural network accelerators a lot. I think AMD, Intel and Qualcomm all use this term for their AI accelerators. I think Apple call their AI accelerators neural engines, but I've definitely heard others refer to these as NPUs even though that's not their official name.

I'll be honest I've never heard the AIA acronym used in this way. It seems all acronyms for all processors need to end in PU, for better or for worse.