What's this number icon in the RubyMine gutter?

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After accidentally pressing some kind of key combo, a "9" in a square has suddenly appeared next to one of my lines of code.

What is this? What does it do? I've never seen it before. If I delete the line, it goes away, but if I recreate it it comes back!

Excuse me if this is a blindingly stupid question :)

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Hello Curtis,

it looks like a bookmark with mnemonic, you can delete it in View | Tool Windows | Favorites | Bookmarks.

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