(I work on Notion) Pages in Notion have an icon you can set. The icon for a new, empty page is a blank piece of paper, and the icon for a page with content is

(I work on Notion) Pages in Notion have an icon you can set. The icon for a new, empty page is a blank piece of paper, and the icon for a page with content is a paper with line on it. We also allow setting an emoji as a page icon (using our emoji picker menu), or uploading or linking to an image file like an SVG. There’s a button to apply a random emoji as a page icon but it’s not a default behavior.