Visibility
Weighted share of search visibility across your search. Top ranks count most.
How visible the product is across the keywords in your search, over the selected period. Every capture of every keyword counts: position 1 contributes the most, each place further down less, down to almost nothing at the end of page 1, and anything beyond page 1 counts as zero. Pages with fewer results, like list layouts, are scaled to their own length, so keywords stay comparable. All variants of a product count together. 100% would mean it held position 1 on every keyword at every capture.
Higher is better.