A turbo warrant is a kind of stock option. Specifically, it is a barrier option of the down and out type. It is similar to a vanilla contract, but with two additional features: It has a low vega, meaning that the option price is much less affected by the implied volatility of the stock market, and it is highly geared due to the possibility of knockout. This type of product is actively traded among investors in Europe and Hong Kong, and has been described as being able to cater to individual investors' behavioral biases.