In trading on Monday, shares of the Daily Russia Bull 3x Shares ETF (RUSL) entered into oversold territory, changing hands as low as $23.759 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 Russia Bull 3x Shares, the RSI reading has hit 29.7 — by comparison, the RSI reading for the S&P 500 is currently 61.1. A bullish investor could look at RUSL's 29.7 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), RUSL's low point in its 52 week range is $17.88 per share, with $43.05 as the 52 week high point — that compares with a last trade of $23.76. Daily Russia Bull 3x Shares shares are currently trading down about 10.5% on the day.