At a previous company, for a very complicated web app with some offline caching aspects, we used the latest git commit hash of each build as a public-facing uni

At a previous company, for a very complicated web app with some offline caching aspects, we used the latest git commit hash of each build as a public-facing unique version id in the help menu. This made it dead simple to use proper semver versioning internally without needing to correct user expectations about version numbers, while still having easily tracked unique IDs in bug reports.