In trading on Tuesday, shares of the SPDR SSgA Global Allocation ETF ( GAL) entered into oversold territory, changing hands as low as $34.29 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 SPDR SSgA Global Allocation, the RSI reading has hit 28.3 — by comparison, the RSI reading for the S&P 500 is currently 33.6. A bullish investor could look at GAL's 28.3 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), GAL's low point in its 52 week range is $32.44 per share, with $36.21 as the 52 week high point — that compares with a last trade of $34.29. SPDR SSgA Global Allocation shares are currently trading down about 0.4% on the day.