Well to tell the truth there isn't much difference between the two.
Items are things that players create, or seek out, to assist themselves or to frustrate others.
They also tend to be on the low end of the power spectrum. They usually have strange and unpredictable powers and a history that makes people seek them out, whether to own them or destroy them. A large quilted blanket checkered with different shades of green. The blanket is designed to block all psychic contact from reaching the person using it. One assumes that someone with sufficient power could bypass this.