Right, every buy has a sell but in charting the oversold/overbought indication is sort of a gauge of the swing of the momentum of price movement, IDK the specs but here's the Stochastics explanation I learned in 1988 to tell if a market is overbought or oversold. Notice the weekly stochastics buy signal on the very bottom HAON chart, it's coming out of oversold and flashes a buy signal over 20% imo. $HAON
Depending on what Chart your look at... looking at the 2min cycle today anytime you see RSI over normal 55 to 100 can be a overbought there’s a lote of information on how RSI CAN MAKE A DIFFERENCE WITH STOCK MOVEMENT again the time ... Ticks 2min, 3 day, 5 day ,daily and monthly