What is this in the sidewalk?

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When I was walking through town I spotted this in the sidewalk. It kind of looks like a Freemason symbol. I can't think of what else it might have been or what it might have been used for. Maybe a sign post was there before? Any ideas?

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SomeMichGuy · M

Two pieces of metal embedded in the concrete, the cut off (with all the crap which finds its way into such a hole left behind).

I think you are right: right-angle piece held the sign, the other piece likely was installed to do any/some of a few candidate jobs (protect the sign from sidewalk scrapers/cleaners; reduce the wind drag from the direction where the curved piece points; etc.).

I *do* like the Freemasonry notion! lol