This is the first sentence of the wikipedia article linked in the comment you responded to: .sh is the Internet country code top-level domain (ccTLD) for Saint Helena
I meant it's not a "generic top-level domain" like .com or .org so its semantic meaning is the "domain name for websites for St Helena." This is similar to the situation for .io, which was really intended for the British Indian Ocean territory but has been appropriated by the tech industry. I'm in favor of using generic TLDs if at all possible. I believe google also treat generic TLDs differently than country-specific TLDs.
