$BDX, Becton Dickinson has rallied strongly from the lows of March.
A "Go" trend was identified in early April and price rose sharply into the high around $262 on April 16th. We have seen a red counter trend correction arrow after that indicating that price may come back in the short term and as it did the GoNoGo Oscillator fell to the zero line as momentum stalled. When a trend is strong, the zero line should act as an objective level of support/resistance. $BDX is in a "Go" trend so we see the oscillator find support at zero and trigger a low risk Go Trend Continuation icon (green circle) under price.