Enclaves

noun

1. A political, cultural or social entity or part thereof that is completely surrounded by another.

   "The republic of San Marino is an enclave of Italy."

2. A group that is set off from a larger population by its characteristic or behavior.

   "...it tends to make marriage itself a lifestyle enclave."

3. An isolated portion of an application's address space, such that data in an enclave can only be accessed by code in the same enclave.