Unown's base Physical Attack and Special Attack are the same, but its Physical Attack is useless, since it can only learn Hidden Power.
Prior to gen 4, entire types were considered Physical/Special (I.e. Fighting was entirely Physical while Psychic was entirely Special). The main gimmick of Hidden Power is that it can be any type depending on IVs, excluding Normal. When it landed on a type that was Physical/Special, it would deal Physical/Special damage. However, come Gen 4 when individual moves were split between Physical/Special, Hidden Power was reworked to be entirely a Special move. Thus, Unown's base Physical Attack being useless.
