In trading on Tuesday, shares of the WisdomTree DEFA Equity Income Fund ETF (DTH) entered into oversold territory, changing hands as low as $45.191 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 WisdomTree DEFA Equity Income Fund, the RSI reading has hit 28.9 — by comparison, the RSI reading for the S&P 500 is currently 48.5. A bullish investor could look at DTH's 28.9 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), DTH's low point in its 52 week range is $44.27 per share, with $50.69 as the 52 week high point — that compares with a last trade of $45.28. WisdomTree DEFA Equity Income Fund shares are currently trading off about 0.4% on the day.