Final answer:
The future interest following a fee simple determinable (FSD) when transferred to another entity remains termed as a 'possibility of reverter'. It describes the potential interest that may revert back to the grantor or a third party if certain conditions are met or violated.
Step-by-step explanation:
When a fee simple determinable (FSD) interest in property is transferred to another party, the future interest created is called a possibility of reverter. However, when this possibility of reverter is subsequently transferred to a third party, it is often termed as such, although the commonly used term still remains 'possibility of reverter'. Real estate laws and terminology can vary by jurisdiction, but the basic concept of transferring a future interest after a condition has been violated remains consistent.