It’s Uniform Resource Locator, according to the original RFC, BCS Glossary, and Tim Berners Lee: https://www.ietf.org/rfc/rfc1738.txt
Though somewhat confusingly, the w3C (who should be the ones that know) refer to this in one document as universal, and link to this file…
What really matters is that this sort of misunderstanding applies to much, much bigger things, where the description in the course support notes doesn’t make it easy to narrow down the possible answers. CSS at Higher is a prime example as pupils can be asked to exemplify it but we currently do not know which properties can be used (and know from last year that they must be spelled exactly correctly).
I’d love to spend hours debating with pupils which ones are most useful/necessary, as I would love to discuss any ambiguity between Uniform and Universal Resource Locators, but there isn’t enough time to do so. We would benefit greatly from detailed course support notes on things where ambiguity is time consuming and unhelpful for learners.