In trading on Friday, shares of the SPDRS&PGlobal Infrastructure ETF ( GII) entered into oversold territory, changing hands as low as $42.31 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 SPDRS&PGlobal Infrastructure, the RSI reading has hit 28.0 — by comparison, the RSI reading for the S&P 500 is currently 57.0. A bullish investor could look at GII's 28.0 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), GII's low point in its 52 week range is $37.70 per share, with $45.13 as the 52 week high point — that compares with a last trade of $42.31. SPDRS&PGlobal Infrastructure shares are currently trading down about 1.1% on the day.