I don't think "reinsurance" is what you mean - that's a technical term referring to a specific kind of contract between insurance companies. But apart from that, I think the only icon of this general nature that Shopify provides is one that says "Shopify secure," described at https://help.shopify.com/themes/customization/store/add-security-badge . There are "apps" that will add other icons to your page.
Hi Matthew, thank you for your answer. What I meant bu "reinsurance" is any way to make the customers feel confortable to buy on the site : like "free shipping" "satisfied or money back", etc. This kind of stuff (see image enclosed). Thank you