<a href="http://www.nytimes.com/interactive/2008/04/07/opinion/20080407_TRADING_GRAPHIC.html" source="New York Times">Op-Chart: Making Money Hand Over Fist</a> is another in a long line of really slick, interactive, infographic presentations. Because of the extreme noise on the trading floor, traders use hand signals to indicate buy/sell interest, prices, amounts and status information. <bq>An oil trader demonstrates the hand signals used on the floor of the New York Mercantile Exchange. Text and graphics by Ben Schott, a contributing columnist.</bq> <img src="{att_link}oil_market_hand_signals-small.png" href="{att_link}oil_market_hand_signals-small.png" align="center" class="frame" caption="Sample of Trading Floor Hand Signals" scale="50%">