In trading on Friday, shares of the iShares International Treasury Bond ETF ( IGOV) entered into oversold territory, changing hands as low as $99.61 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 Treasury Bond, the RSI reading has hit 27.6 — by comparison, the RSI reading for the S&P 500 is currently 48.0. A bullish investor could look at IGOV'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), IGOV's low point in its 52 week range is $99.11 per share, with $105.43 as the 52 week high point — that compares with a last trade of $99.78. iShares International Treasury Bond shares are currently trading down about 0.4% on the day.