A "visual reminder" is an image or an object that helps you remember or recall something visually. It serves as a prompt to help you remember something important or bring back a memory. Full definition
If a blurb isn't available, then a cover will do because it makes a good visual reminder of what it's about. (dearauthor.com)
The trick that has been working for me is that I have been using smaller bottles as visual reminders and easier to quantify how much I am getting in throughout the day. (runonveg.com)
These cards are great visual reminders for young children. (tes.com)