In trading on Friday, shares of the iShares Core Aggressive Allocation ETF (AOA) entered into oversold territory, changing hands as low as $45.81 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 Core Aggressive Allocation, the RSI reading has hit 29.9 — by comparison, the RSI reading for the S&P 500 is currently 31.4. A bullish investor could look at AOA'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), AOA's low point in its 52 week range is $40.59 per share, with $47.98 as the 52 week high point — that compares with a last trade of $45.88. iShares Core Aggressive Allocation shares are currently trading off about 0.2% on the day.