A female genital piercing using a captive bead ring or a circular barbell. The piercing is made in the clitoral hood behind the clitoris, so the jewellery runs behind the clitoris. Often used with a standard horizontal hood piercing. Incredible sensations are reported from a Triangle. Only to be performed by very experienced piercers.
My wife used to have 2 triangles and 3 horizontals on her hood, and did she go off when I ran my fingernail over them...!