Rabbit ear
A rabbit ear is a move where two edges of a triangular flap are folded inward at the same time, so the paper between them stands up as a thin point that is then laid to one side.
First crease the lines that bisect two of the triangle’s corners; they meet somewhere inside the triangle. Then fold both edges in along those creases together, pinch the small ridge that rises from where they meet, and flatten it to the left or right. The move is often used to make a narrow leg, ear or fin from a wide flap.
Trouble usually comes from vague or misplaced bisector creases, which make the point collapse off-center or wrinkle. Crease each line precisely, then collapse slowly and let the ridge form on its own before choosing the side. None of the current models on this site need a rabbit ear, but it appears in many traditional animals.