This property describes a two-handed or a versatile weapon that a Small character can use in the same way a Medium character can. A halfling can use a shortbow, for instance, even though halflings can’t normally wield two-handed weapons.

Published in Player's Handbook, page(s) 217, Mordenkainen's Magnificent Emporium, page(s) 20, Rules Compendium, page(s) 270.