In trading on Tuesday, shares of the iShares Asia Developed Real Estate ETF ( IFAS) entered into oversold territory, changing hands as low as $32.21 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 Asia Developed Real Estate, the RSI reading has hit 29.9 — by comparison, the RSI reading for the S&P 500 is currently 56.6. A bullish investor could look at IFAS's 29.9 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), IFAS's low point in its 52 week range is $29.29 per share, with $35.54 as the 52 week high point — that compares with a last trade of $32.21. iShares Asia Developed Real Estate shares are currently trading off about 0.8% on the day.