AVZ chart, page-12572

Apart from the fact that not all gaps will be closed there seem to obvious differences around here of what constitutes an opening gap up. Here is an attempt to clear this up.
Gap Up Opening:
When the next day’s opening price is higher than the previous day’s close, this is known as a gap up opening. This usually indicates that the market has opened with positive sentiments, like caused by a positive announcement.
However there are two types of Gap Up openings.
1. Full Gap Up Opening:
When the next day’s opening price is higher than the previous day’s high price, like in this case, this is known as a Full gap up opening.
2. Partly Gap Up Opening:
When the opening price is higher than the previous day’s closing but not higher than the previous day’s high price, this is known as a partial gap-up.