In trading on Friday, shares of the iShares International Developed Real Estate ETF ( IFGL) entered into oversold territory, changing hands as low as $30.43 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 iShares International Developed Real Estate, the RSI reading has hit 27.6 — by comparison, the RSI reading for the S&P 500 is currently 46.7. A bullish investor could look at IFGL's 27.6 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), IFGL's low point in its 52 week range is $28.63 per share, with $32.64 as the 52 week high point — that compares with a last trade of $30.56. iShares International Developed Real Estate shares are currently trading off about 1.2% on the day.