In trading on Wednesday, shares of the iShares Target Date 2050 ETF ( TZY) entered into oversold territory, changing hands as low as $34.22 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 Target Date 2050, the RSI reading has hit 29.9 — by comparison, the RSI reading for the S&P 500 is currently 35.8. A bullish investor could look at TZY'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), TZY's low point in its 52 week range is $30.72 per share, with $37.28 as the 52 week high point — that compares with a last trade of $34.91. iShares Target Date 2050 shares are currently trading down about 0.1% on the day.