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by johncoltrane 4670 days ago
It's \\\ and it comes from the commentary plugin. It was the default mapping when it was released but it was changed a few months ago. \\\ is still available, though.

Yes, lots of people use <leader>something mappings because they offer a lot more flexibility than <C-something> and friends. What you use as mapleader is up to you, "," is simply the value suggested in the doc.