In trading on Tuesday, shares of the Short High-Yield Municipal Index ETF ( SHYD) entered into oversold territory, changing hands as low as $24.92 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 Short High-Yield Municipal Index, the RSI reading has hit 29.8 — by comparison, the RSI reading for the S&P 500 is currently 36.8. A bullish investor could look at SHYD'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), SHYD's low point in its 52 week range is $24.92 per share, with $26.05 as the 52 week high point — that compares with a last trade of $25.02. Short High-Yield Municipal Index shares are currently trading off about 0.5% on the day.