In trading on Thursday, shares of the iShares Core International Aggregate Bond ETF ( IAGG) entered into oversold territory, changing hands as low as $52.17 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 International Aggregate Bond, the RSI reading has hit 27.7 — by comparison, the RSI reading for the S&P 500 is currently 59.2. A bullish investor could look at IAGG's 27.7 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), IAGG's low point in its 52 week range is $50.02 per share, with $54.18 as the 52 week high point — that compares with a last trade of $52.34. iShares Core International Aggregate Bond shares are currently trading off about 0.2% on the day.