In trading on Friday, shares of the SPDR S&P BRIC 40 ETF (BIK) BIK entered into oversold territory, changing hands as low as $22.1601 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 BRIC 40, the RSI reading has hit 28.8 — by comparison, the RSI reading for the S&P 500 is currently 47.8. A bullish investor could look at BIK's 28.8 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), BIK's low point in its 52 week range is $20.27 per share, with $25.30 as the 52 week high point — that compares with a last trade of $22.29. SPDR S&P BRIC 40 shares are currently trading down about 2% on the day.