In trading on Monday, shares of the SPDR S&P International Energy Sector ETF ( IPW) entered into oversold territory, changing hands as low as $20.75 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 SPDR S&P International Energy Sector, the RSI reading has hit 28.6 — by comparison, the RSI reading for the S&P 500 is currently 76.0. A bullish investor could look at IPW's 28.6 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), IPW's low point in its 52 week range is $20.75 per share, with $29.82 as the 52 week high point — that compares with a last trade of $20.84. SPDR S&P International Energy Sector shares are currently trading down about 2.2% on the day.