Some sort of thing with a swivel to it.

[Rooster Cogburn]

I posted a what is it last night and was amazed at how fast the answer came. We'll see how quick this one gets solved. This was found in a junior high open lawn at about 6 inches...

and the flip side where it was broken away...

 

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[dscott67]

i have no idea !! yet !

 

[deepskyal]

Part of an old in-ground lawn sprinkler.

Al

 

[Monty]

Looks like a piece of a U-joint, probably from a grass mower or brush hog. Monty