Extol

Extol (エクストル, Ekusutoru) is the currency used in Skypiea. Normally written as a capital "E" with a slash through it like a dollar sign. There are 10,000 extols per Beli, making it so that it would roughly be the equivalent of about 1,000,000 extols per 100 Beli.

Nothing else is known about Extol.