In trading on Wednesday, shares of the iShares Core 10+ Year USD Bond ETF ( ILTB) entered into oversold territory, changing hands as low as $59.51 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 10+ Year USD Bond, the RSI reading has hit 28.0 — by comparison, the RSI reading for the S&P 500 is currently 55.9. A bullish investor could look at ILTB's 28.0 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), ILTB's low point in its 52 week range is $59.51 per share, with $67.38 as the 52 week high point — that compares with a last trade of $59.67. iShares Core 10+ Year USD Bond shares are currently trading down about 0.6% on the day.