Microsoft Dynamics AX 2012 underwent a name change in what would have been version 7. The product has been split, in terms of licensing, into Microsoft Dynamics 365 Finance and Microsoft Dynamics 365 Supply Chain Management. This is a further evolution from the previous name of Microsoft Dynamics 365 for Finance and Operations.
Even though it appears to be a component of Microsoft Dynamics 365, it is a separate product, so we can't abbreviate the name to Dynamics 365. We will refer to the product as either its full name or the SCM abbreviation that is used by Microsoft internally. You may see references to Unified operations in some Microsoft documentation.