Found a whatsit.

[gentleone444]

Found at an old school site. Magnet sticks to it so it is steel...maybe a corrugated...my thought are water pipe cap or fence part? Any ideas?

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[Loco-Digger]

Top cap off a post of a chain link fence I presume.

 

[gentleone444]

I think its a antique version of this part of a fence.

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[GA_Boy]

I think its a antique version of this part of a fence.

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You nailed it. I couldn't find a picture in the modern stuff.
Marvin

 

[RustyGold]

Good id folks!