Here are the tickers for all the recent ProShares launches (corrected from earlier version, based on the AMEX site: press release 1, press release 2):
1x Short the NASDAQ-100 (PSQ)
1x Short the S&P 500 (SH)
1x Short the S&P MidCap (MYY)
1x Short the Dow Jones Industrial Average (DOG)
2x...