RE: oil price6 Oct 2020 16:10
On daily charts, a gap is initially seen when the opening price today diverges dramatically from yesterday’s high or low
Or
You can identify a gap at the open, but you can’t measure a gap until the day’s trading is over. Then you measure it from yesterday’s high to today’s low (for an upside gap) or from yesterday’s low to today’s high (for a downside gap).