In trading on Monday, shares of the iShares MSCI Emerging Markets Materials Sector Index Fund ETF (EMMT) entered into oversold territory, changing hands as low as $18.35 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 iShares MSCI Emerging Markets Materials Sector Index Fund, the RSI reading has hit 29.1 — by comparison, the RSI reading for the S&P 500 is currently 52.0. A bullish investor could look at EMMT's 29.1 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), EMMT's low point in its 52 week range is $17.57 per share, with $22.50 as the 52 week high point — that compares with a last trade of $18.35. iShares MSCI Emerging Markets Materials Sector Index Fund shares are currently trading down about 4.6% on the day.