What actually is a "system card"?

When I hear the term, I'd expect something akin to the "nutrition facts" infobox for food, or maybe the fee sheet for a credit card, i.e. a concise and importantly standardized format that allows comparison of instances of a given class.

Searching for a definition yields almost no results. Meta has possibly introduced them [1], but even there I see no "card", but a blog post. OpenAI's is a LaTeX-typeset PDF spanning several pages of largely text and seems to be an entirely custom thing too, also not exactly something I'd call a card.

[1] https://ai.meta.com/blog/system-cards-a-new-resource-for-und...