In trading on Thursday, shares of the Guggenheim BulletShares 2017 High Yield Corporate Bond ETF ( BSJH) entered into oversold territory, changing hands as low as $26.84 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 Guggenheim BulletShares 2017 High Yield Corporate Bond, the RSI reading has hit 27.4 — by comparison, the RSI reading for the S&P 500 is currently 51.3. A bullish investor could look at BSJH's 27.4 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), BSJH's low point in its 52 week range is $26.42 per share, with $27.72 as the 52 week high point — that compares with a last trade of $26.85. Guggenheim BulletShares 2017 High Yield Corporate Bond shares are currently trading off about 0.2% on the day.