It's supposed to be for, well, breadsticks. But it can also be used for tamales*, or to toast bread.
*Tamales are usually made by the dozen; This pan has only 11 spaces.
You could possibly use it as a small broiler pan, but it's only 7 inches wide.
Here's a breadstick recipe.
It's sometimes incorrectly called a cornbread pan. Although you can make cornbread in it, it's a breadstick pan, not a cornbread pan.
It's very rare, so if you can't get one, not to worry. You can use a cornstick pan for breadsticks.
Wagner and Griswold used to make them; One is listed on ebay for $65, more than I want to pay.
So I guess I'll have to stay happy with using my cornstick pan.