UDN
The Invesco Invesco DB US Dollar Index Bearish Fund -1x Shares (UDN) is an exchange-traded fund (ETF) that tracks the performance of the Deutsche Bank Short US Dollar Index (USDX) Futures Index. The fund is managed by Invesco and was launched in 2007.
The Deutsche Bank Short US Dollar Index (USDX) Futures Index measures the performance of a short position in the U.S. dollar against a basket of six major world currencies. It appreciates when the U.S. dollar weakens relative to currencies including the euro, Japanese yen, and British pound.
UDN is a passively managed index ETF that seeks to replicate the holdings and performance of its benchmark with low tracking error. It is suitable for investors seeking broad, low-cost market exposure.
This is used in this portfolio Insomniac