Standard Index Funds

QQQQ - NDX 100
SPY - SP500
DIA - Dow Jones Industrials
MDY - SP Mid Cap 400
IWM - Russell 2000

Short/Bear Funds (Allows you to short in IRA/401K accounts)

PSQ - Short QQQ Inverse of the NASDAQ-100
SH - Short S&P500 Inverse of the S&P 500
DOG - Short Dow30 Inverse of the DJIA
MYY - Short MidCap400 Inverse of the S&P Mid Cap 400

2x Margin Built In (Allows you to leverage IRA/401K)

QLD - Double the NASDAQ-100
SSO - Double the S&P 500
DDM - Double the DJIA
MVV - Double the S&P MidCap 400

QID - Double the inverse of the NASDAQ-100
SDS - Double the inverse of the S&P 500
DXD - Double the inverse of the DJIA
MZZ - Double the inverse of the S&P MidCap 400