Promo
Share of the days a product was visible on which it ran a coupon or a deal.
Out of the days this product actually appeared on your tracked keywords, the share on which it ran a promotion — a coupon or a deal. Days when the product didn't appear at all aren't counted, so a competitor that only surfaces occasionally can still show a high share.
Neither good nor bad on its own — a rising share usually means a competitor is pushing harder on price.