What is the difference between B, B+, B* trees?

Question

PostgreSQL

B tree, stores data in nodes. B+ tree stores data in leaves. What is the difference between a B* tree and the rest of the B tree?

Answer 1

A B*-tree is a type of B-tree in which each node of the tree is at least 2/3 full (as opposed to a B-tree, where this figure is 1/2). A B+ tree that satisfies these requirements is called a B+*-tree.
Wiki B* tree