Biracks: a notational proposal and applications

I propose a notation for biracks that includes from the begining the knowledege of the associated (or underlying, or derived) rack structure. Motivated by results of Rump in the involutive case, this notation allows to generalize some results from involutive case to the non necessarily involutive solutions, and also to view some twisting constructions and its relation to the underlying rack structure in a more transparent way. Two applications are given.