In trading on Monday, shares of the WisdomTree DEFA Equity Income Fund ETF (DTH) entered into oversold territory, changing hands as low as $41.34 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 29.1 — by comparison, the RSI reading for the S&P 500 is currently 38.3. A bullish investor could look at DTH's 29.1 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 $40.65 per share, with $49.77 as the 52 week high point — that compares with a last trade of $41.42. WisdomTree DEFA Equity Income Fund shares are currently trading off about 2.5% on the day.