- In Greek-based number-naming systems, 30 is associated with prefix "triaconta-", and with prefix "triginti-" in Latin systems.
- In the Misalian seximal system, this number is called "fifsy", because it's five times six.
- Nirvana Supermind coined zero-ternol for this number and is equal to Q<10,3> in quick array notation.
As a banknote denomination
The Tunisian dinar had banknotes with this number in the denomination.