Set of head hairs. Hair, hair, lighter, lock, mane, locks. Surname of Spanish origin. Last name of the Attorney General in Colombia (Margarita Cabello). Name of a port or city in Venezuela.
Hair is said almost exclusively of the one that grows on the human head. It would also be a case of inherent singular because it names the hair, the whole (excluding the beard in men), although if they are loose or only in a lock it is said 'hairs'. It comes from the Latin capillus, i with the same meaning.