In trading on Friday, shares of the DB Gold Fund ETF (DGL) entered into oversold territory, changing hands as low as $50.51 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 DB Gold Fund, the RSI reading has hit 24.8 — by comparison, the RSI reading for the S&P 500 is currently 68.3. A bullish investor could look at DGL's 24.8 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 $50.51 per share, with $61.82 as the 52 week high point — that compares with a last trade of $50.67. DB Gold Fund shares are currently trading down about 4.8% on the day.