sameAs

Schema.org defines sameAs as the URL of a reference page that unambiguously indicates the item's identity, with Wikipedia, Wikidata and official websites as typical examples. Google's Organization structured data guide describes it as a page on another website with more information about your organisation, such as a social media or review site profile, and allows several.

For a manufacturer the list is usually short: the company LinkedIn page, a Wikidata entry if one exists, and official profiles you control. It matters most when another company has a similar name, because the links help separate the two in the Knowledge Graph. Point only to profiles that are yours and kept current, link back to the website from each one, and check the list survives any rebuild, since it lives in the site's structured data and is easy to lose with old templates.