In trading on Thursday, shares of the PowerShares DB Gold Fund ETF ( DGL) entered into oversold territory, changing hands as low as $41.08 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of PowerShares DB Gold Fund, the RSI reading has hit 26.6 — by comparison, the RSI reading for the S&P 500 is currently 51.3. A bullish investor could look at DGL's 26.6 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), DGL's low point in its 52 week range is $39.84 per share, with $46.61 as the 52 week high point — that compares with a last trade of $41.08. PowerShares DB Gold Fund shares are currently trading down about 1.3% on the day.