I always wonder about that.  There's also an actual page that could theoretically be hit: https://en.wikipedia.org/w/index.php?title=-&redirect=no

On Wed, Dec 2, 2015 at 11:58 AM, Gabriel Wicke <gwicke@wikimedia.org> wrote:
Historically, I vaguely remember that we have used that title for user
script / style loading with action=raw. I think that's gone from the
skin code, but it's possible that user scripts still reference this
title.

Gabriel

On Wed, Dec 2, 2015 at 8:41 AM, Oliver Keyes <okeyes@wikimedia.org> wrote:
> One of the most prominent top articles has no page; it's "-". What is this?
>
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> Oliver Keyes
> Count Logula
> Wikimedia Foundation
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Gabriel Wicke
Principal Engineer, Wikimedia Foundation

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