In trading on Monday, shares of the EGShares Brazil Infrastructure ETF ( BRXX) entered into oversold territory, changing hands as low as $14.40 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 EGShares Brazil Infrastructure, the RSI reading has hit 29.8 — by comparison, the RSI reading for the S&P 500 is currently 50.0. A bullish investor could look at BRXX'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), BRXX's low point in its 52 week range is $14.23 per share, with $19.67 as the 52 week high point — that compares with a last trade of $14.47. EGShares Brazil Infrastructure shares are currently trading down about 4.1% on the day.