what does rsi mean 
the relative strength index rsi measures the price momentum of a stock or other security the basic idea behind the rsi is to measure how quickly traders are bidding the price of the security up or down the rsi plots this result on a scale of 0 to 100 readings below 30 generally indicate that the stock is oversold while readings above 70 indicate that it is overbought traders will often place this rsi chart below the price chart for the security so they can compare its recent momentum against its market price 