5 Heol

The Heol is a local complementary currency (monnaie complémentaire) circulating in the Pays de Brest area of Brittany, part of a broader French mouvement des monnaies locales that accelerated after the 2008 financial crisis. Like most French monnaies solidaires, Heol units are backed one-for-one against euros held in a dedicated account, and participating businesses agree to reinvest a share of transactions locally. The name means "sun" in Breton.

Serial numbers on issues of this type are the primary — often only — security feature, which keeps printing costs low enough for a community-run scheme to sustain.