In trading on Wednesday, shares of the ProShares UltraPro Nasdaq Biotechnology ETF ( UBIO) entered into oversold territory, changing hands as low as $19.93 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 ProShares UltraPro Nasdaq Biotechnology, the RSI reading has hit 29.8 — by comparison, the RSI reading for the S&P 500 is currently 37.4. A bullish investor could look at UBIO'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), UBIO's low point in its 52 week range is $17.37 per share, with $61.06 as the 52 week high point — that compares with a last trade of $20.05. ProShares UltraPro Nasdaq Biotechnology shares are currently trading off about 2.2% on the day.