1 Cent Piece

Actually myself and I suspect most others call it both, depending on the circumstance.
(examples) Have you got a penny? I will give you my 2 cents worth.
It appears if it is singular we mostly use penny, Plural we use Pennies or cents

Another vote for both, depending on context.

I say penny when I am out there in the real world making change, I usually refer to the US cent as a cent when I am amongst collectors.
If I put on my dumb act at a coin show, or coin shop, I say,
"May I look at that penny over here please?"

I know this is a heated topic for some, but as long as I remember, and that is a long time now, I hardly ever hear anyone refer to a single cent as a cent except when I am around the coin collecting crowd.
So I voted penny.
I do most often hear just the opposite however, when these are plural, Two Cents, Three Cents, etc.
Never hear that a bottle coke used to be only 10 pennies.

Aunt Betty never gave me a nice new shiny cent.
Although she did smell somewhat.
Oh that is a scent, sorry.
She did mail me a Birthday card when I was little, and sent along a couple or few $1.00 bills.

I actually voted for cent, but I had to chuckle at the inclusion of worthless as a choice!

While the coin may say "one cent" it does not say just "cent." it is one percent of 1 dollar. 1 cent - which refers to the amount of money it represents in terms of dollars - one percent of one hundred cents.

It's a penny if you are talking in the language of ordinary people, and you are referring to the common name of the coin itself. Look, no one calls it "five cents" or a "five cent piece", but you'll hear people ask for it by name - nickel, which does not appear anywhere on the coin itself

And it is A quarter, or does anyone here go by what it says on the coin "quarter dollar"? no, its a "quarter."

so if you are looking for one cent, you can ask for either, a cent (the actual amount of money you want) or a penny (the common word for the particular coin).

Or when you go to the store, and you find out your change is 57 cents, do you really expect it to all be in pennies, because you think a "cent" only refers to the one cent coin?

chose cent.......but use both......

It's a penny when I'm looking for pocket change. It's a Lincoln Cent if it's in my collection or I'm looking for one to add to my collection.

I call it a penny but I use both.