Correct name for a U shaped Nail/staple?

I was wondering what the correct name for a U shaped Nail is, we use it to tack fences to posts and stuff, is it just "u shaped nail" or is there a more correct term? I was wondering because my grandmother calls it a "stifle" which means to suffocate i tried looking it up and i cant figure out... show more I was wondering what the correct name for a U shaped Nail is, we use it to tack fences to posts and stuff, is it just "u shaped nail" or is there a more correct term? I was wondering because my grandmother calls it a "stifle" which means to suffocate i tried looking it up and i cant figure out why she would call it that unless its polish for staple or nail because her father was pure right out of Poland and grew up on the farm working with him.So i thought maybe she picked it up from him. Weird question i know but if anyone has a clue as to why she would call it that(and the correct name) thank you much.
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