We support most international currencies on Invoiced. This article walks through how to use different currencies. If you don't see your currency listed in the dashboard then please contact us at email@example.com to have it added.
You can change the currency used for any given invoice, estimate, or plan by clicking Options when drafting it. More options will appear, including a Currency option. Just select the currency you intend to use and the currency symbol will be updated.
If you want to change your business currency you can do this by following the instructions in this article.