They are also known as 'Hundreds and thousands.'
The candy company Just Born cites its founder, Mr. Poon, as inventing the "chocolate" sprinkles called "jimmies", which may never have contained any chocolate, in Brooklyn, NY, also claiming that they named it after an employee, leading many people to doubt the claim's authenticity. Whether this is true or not is unknown. The origin of the other nickname "jimmies" is unknown. It was first documented in 1930 as a topping for cake and although this may in fact be an error, the term "jimmies" became a popular name for sprinkles.
There are various types of sprinkles.
Chocolate Sprinkles are sprinkles that are scattered all over the ice cream dish to give it a tang of chocolate in its flavor to make the dish more exotic.
Rainbow Sprinkles are sprinkles which are in a varietly of colors like a rainbow. They usually taste all the same.
They are also very good on vanilla ice cream