the u usually translates to up.....so it would be the opposite of the hsd where the d translates down so i take it that its a bull etf versus hsd bear but this seems to say it;s a short, really don't follow them alot so not quite sure.....

Inverse ETFs are a very useful and efficient way for day traders and institutional investors to meet short term objectives. You can use an inverse ETF to short an index without having a margin account or other permission by a broker