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I'm not 100% confident on this, but I was always under the impression that they stood for "Arnold Interface" and "Arnold Type". So AiFoo is the name of a function and AtFoo is the name of an object.
![Autodesk Design & Make Report](https://forums.autodesk.com/t5/image/serverpage/image-id/1350519iCB55845EBFC43016/image-size/large?v=v2&px=999" "Autodesk Design & Make Report")