It looks like you're referring to a specific technical flag or an element from Chrome’s internal new tab page (like most_visited9 – possibly a grid position or a debugging class).

Here’s a blog post written for developers and power users. Unlocking Chrome’s New Tab Page: What is most_visited9 and How to Tweak Your Top Sites

Today, we’re decoding most_visited9 and showing you how to take full control of those shortcuts. In Chrome’s source code and internal rendering logic, each shortcut tile on the New Tab Page is assigned a numeric index: most_visited0 through most_visited7 (or most_visited8 depending on the version). But some Chromium builds, experiments, or debugging tools show indices up to most_visited9 .

Since that exact phrase isn’t a standard user-facing feature, I’ll assume you’d like a , using most_visited9 as a placeholder for the 9th tile in the grid.