bond (only dividends)
fund (a portfolio of different investment tools)
stock market (long)
stock market (short)
warrant (call) (long)
warrant (call) (short)
warrant (put) (long)
warrant (put) (short)
N.B.: warrant can be on everything, such as index (HSI, etc.), stock, commodities, resources (oil, etc), mortgage contract, etc.
bank interest
insurance
property market
expensive metal
etc.