In trading on Tuesday, shares of the iShares MSCI China Small-Cap ETF ( ECNS) entered into oversold territory, changing hands as low as $44.46 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 China Small-Cap, the RSI reading has hit 29.99 — by comparison, the RSI reading for the S&P 500 is currently 51.5. A bullish investor could look at ECNS's 29.99 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), ECNS's low point in its 52 week range is $42.95 per share, with $50.01 as the 52 week high point — that compares with a last trade of $44.63. iShares MSCI China Small-Cap shares are currently trading off about 2.1% on the day.