The full name is Windows 10 Enterprise LTSC (Long Term Servicing Channel). It's a variant of the Enterprise edition and is the Windows 10 equivalent of Windows 7 Ultimate.

LTSC is:

clean (no pre-installed non-removable junk "apps" and no ads),

resource efficient (no cortana and other background processes) and

stable (no feature updates to break your computer - just security and bug fixes for 10 years).