In trading on Friday, shares of the WisdomTree Global ex-US Utilities Fund ETF (DBU) entered into oversold territory, changing hands as low as $18.30 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 Global ex-US Utilities Fund, the RSI reading has hit 29.5 — by comparison, the RSI reading for the S&P 500 is currently 45.8. A bullish investor could look at DBU's 29.5 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), DBU's low point in its 52 week range is $17.28 per share, with $20.95 as the 52 week high point — that compares with a last trade of $18.30. WisdomTree Global ex-US Utilities Fund shares are currently trading off about 0.7% on the day.