A common currency is a term used to describe the same form of money that is accepted and used across a group of countries or regions. Some synonyms for common currency include shared currency, universal currency, and unified currency. Shared currency implies a joint ownership and responsibility for the currency, while universal currency suggests acceptance and use across the globe. Unified currency implies the streamlined use of the currency in a particular area, with all parties having access to and agreeing on its use. Regardless of the synonym, a common currency plays a significant role in facilitating international trade and economic harmony between different nations and regions.