Split end sqaured nail

[allison86]

I dug up so many sqaured nails at the park that was a mid 1800s army fort. But none that looks like that this was it possible this sqaured nail was made for something else?

 

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[GA_Boy]

It appears to be an "Old time" cotter pin/key used to enuts from loosening on bolts. Just a guess.
Marvin
Square Head Split Nail | Hardware Renaissance