That is the baculum of an extinct bear. It's pretty much a fossil dick.
A baculum, if you didn't know, is a fancy word for a penile bone.
It's pretty handy, actually.
This specific baculum fossil came from Indarctos arctoides, a bear that marauded around Europe between 4.5 and 10 million years ago.
Despite Indarctos arctoides being smaller than many living bears, it nevertheless had a much larger baculum than anything found in bears today — 9.2 inches long on average.
Based on its length, the scientists who discovered the fossil argued that this bear species may have had longer, but fewer, sexual encounters than other mammals.