Physical/Variable illustration from BkO
Physical/variable is an elemental affiliation for objects, attacks, or Magic contained in Magnus
Referred to as Physical or Neutral in Baten Kaitos: Eternal Wings and the Lost Ocean, these Magnus simply have no elemental effect.
In Baten Kaitos Origins, these Magnus are referred to as Variable with the same neutral properties, however they can be aligned to any of the other Elements when used in conjunction with elementally affiliated equipment.