Unless specifically noted otherwise, all models are assumed to be carrying a hand weapon of some kind. The term 'hand weapon' is used to describe any weapon held in one hand and not otherwise covered by the rules. As such it includes swords. axes clubs, maces, etc.
Rules: No special weapon rules apply to hand weapons but they do have the advantage that they can be used in combination with each other (see Fighting with a Weapon in Each Hand) or with a shield (see Fighting with a Hand Weapon and Shield).