Piloerection (n) - hair standing on end

Cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal, a.k.a. Arianna's hair

My daughter's hair will not lay down. Ever. From her first few days of exploring this big world, that little certain area of her hair has been sticking straight up. Even after a bath, clean and wet and laying flat upon her sweet head, at the first breath of dryness, those well-postured strands rise again. She's such a cutie.