The Yemeni rial is the official currency of Yemen and is abbreviated as YER. However, there are other words that can be used as synonyms for the Yemeni rial. These include the Yemeni currency, South Arabian riyal, and Yemeni dinar. While the rial was introduced in 1965, it has undergone several changes in value over the years, with devaluation being a common trend. The currency has also been associated with political instability and conflicts such as the Yemeni Civil War. Despite these challenges, the rial remains the primary currency used in Yemen for transactions and as a store of value.