The Special drawing rights (SDRs from the IMF) basket is consisted of the following five currencies: U.S. dollar 41.73%, euro 30.93%, renminbi (Chinese yuan) 10.92%, Japanese yen 8.33%, British pound 8.09%.
Special drawing rights were created by the IMF in 1969 and were intended to be an asset held in foreign exchange reserves under the Bretton Woods system of fixed exchange rates. 1 XDR was initially defined as US$1, equal to 0.888671 g of gold. After the collapse of that system in the early 1970s the SDR has taken on a less important role. Acting as the unit of account for the IMF has been its primary purpose since 1972.
Terra SDR Stablecoin is used by the Terra Ecosystem to mint stablecoins, details can be found in the Whitepaper.