It takes a hundred pennies to make a dollar. Even though it doesn't have a heck of a lot of value, a penny may bring you luck if you pick it up (as the saying goes).
In the US, a penny is a one-cent, copper-colored coin, which features Abraham Lincoln's profile on one side. Many countries' currencies include pennies as the very smallest unit of money, including Canada, Britain, and South Africa. While the plural form of penny is pence in the UK, and it's often abbreviated as p there, in North America the plural is commonly pennies — and sometimes cents.