Return On Sales (ROS), /or profit margin/
A measure of a company's profitability, equal to a fiscal year's pre-tax income divided by total sales
Reversing trade
Entering the opposite side of a currently held futures position to close out the position.
Reward-to-Volatility Ratio
Ratio of excess return to portfolio standard deviation.
Risk Control
Using of trading rules for restriction of losses.
A transaction designed for spot deals whereby the delivery is extended and "exchanged" from the old spot delivery date to the current spot delivery date.