triangle piercing
A triangle piercing is a specific type of clitoris piercing. It's like a hch_piercing, but significantly deeper, so that it passes under the shaft of the clitoris. Note that it should not appear in between the labia, otherwise that would just be a pair of inner labia piercings linked together.
Triangle piercings are rare IRL because it's anatomically impossible to place them correctly on the majority of typical human female vulvae. In fact, the main demographic of people who get them are transmasculine, and even the cis women who get them are often only able to because of having an intersex condition or taking steroids.
IMPORTANT: A "triangle piercing" is not a piece of jewellery that happens to be shaped like a triangle, nor is it any piercing on any triangle-shaped body part.