symbol
The default symbolSortKey for all annotations added to this annotation manager if not overwritten by individual annotation settings.
Sorts features in ascending order based on this value. Features with lower sort keys are drawn and placed first. When {@link PropertyFactory#iconAllowOverlap} or {@link PropertyFactory#textAllowOverlap} is false, features with a lower sort key will have priority during placement. When {@link PropertyFactory#iconAllowOverlap} or {@link PropertyFactory#textAllowOverlap} is set to true, features with a higher sort key will overlap over features with a lower sort key.