In trading on Thursday, shares of the Daily 20+ Year Treasury Bear 3x Shares ETF ( TMV) entered into oversold territory, changing hands as low as $40.2201 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 Daily 20+ Year Treasury Bear 3x Shares, the RSI reading has hit 29.8 — by comparison, the RSI reading for the S&P 500 is currently 61.0. A bullish investor could look at TMV's 29.8 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), TMV's low point in its 52 week range is $40.2201 per share, with $77.05 as the 52 week high point — that compares with a last trade of $40.59. Daily 20+ Year Treasury Bear 3x Shares shares are currently trading off about 1.6% on the day.