What Does This Road Sign Mean?

Searching the web for a specific image, I came across a sign that confused the heck out of me. Granted, it’s usually easy to confuse me but I would assume MANY drivers would be confused by one of these road signs.

Feast your eyes on this…
Confused?

What in the world does this mean? Is it intended to be mounted horizontally on really steep hills?

I figure it has to be an add-on below some other type of informational road sign.  Much like the 3-way or 4-way plates below some stop signs.

Any suggestions?  Submit your ideas in comments.

In the meantime I’m going to contact the manufacturer for enlightenment.

 

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