Naming a men's cologne after a mathematical constant suggests intellectual ambition, and Pi Cologne mostly earns the reference through an unusually gourmand, anise-forward structure. Mandarin orange, tarragon, rosemary and basil open this Eau de Toilette herbal and slightly bitter, an unconventional citrus opening. Anise, neroli, geranium and lily-of-the-valley fill the core, licorice-sweet against the herbal top. Vanilla, almond, tonka bean, benzoin and cedar close out a dense, warm drydown that reads closer to dessert than a typical fresh men's fragrance. Givenchy classifies this Pi Eau de Toilette as oriental gourmand, built for evening wear specifically, where that anise-vanilla combination has room to actually register. Tarragon in that opening accord is a distinctly culinary, licorice-adjacent herb that sets up the anise arriving later in the heart, a structural echo that ties the fragrance's herbal beginning to its eventual gourmand destination more deliberately than most men's fragrances bother attempting. Released at the turn of the millennium, it remains one of the more distinctive gourmand entries in men's perfumery, precise in concept the way its namesake constant is precise in mathematics, and it continues to draw a small but devoted following among wearers specifically seeking out unconventional anise-forward compositions.