Micronations, despite not being recognized as "real" countries by Earth's governments, still make meatspace flags and issue things like coins, currency, stamps, ID cards, and passports.
Many micronations have micronational languages, a subcategory of artistic languages. The most famous micronational language is R. Ben Madison's Talossan, a Romance (albeit without derivation) conlang with a lexicon of some 35,000 words. The speakers of micronational languages actually learn and speak these languages when they meet up or partake in micronation-related activities. The speakers make these languages real. As a result, micronational languages typically have more speakers than personal languages, altlangs, or Internet-based fictional languages like Teonaht or Arka.