 In Boole's account of his algebra, terms are reasoned about equationally, without a systematic interpretation being assigned to them.In places, Boole talks of terms being interpreted by sets, but he also recognises terms that cannot always be so interpreted, such as the term 2AB, which arises in equational manipulations.Such terms he classes "uninterpretable terms"; although elsewhere he has some instances of such terms being interpreted by integers.