listview ShowSortMark property
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Applies to
acListView and acDBListView components.  

property ShowSortMark: Boolean;  

The ShowSortMark property specifies whether you would like to show the arrow-style sort mark (aclistviewsortmarkasc or aclistviewsortmarkdesc) on the header sections, which indicates the sorting direction on the column. Set ShowSortMark to False if you don't want to show these marks.  
tip The sort mark can be "raised" or "sunken". To change the style of sort mark use SortMarkKind property.  

The sort mark will be invisible anyway, if SortType property is stNone.  

See also
SortMarkKind, SortColumn and SortDirection properties.