Special numbers, special quaternions and special symbol elements

{\small In this paper we define and we study properties of} $(l,1,p+2q,q\cdot l)-$ {\small numbers,} $\left(l,1,p+2q,q\cdot l\right) -$quaternions,$\left(l,1,p+2q,q\cdot l\right) -$ {\small symbol elements. Finally, we obtain an algebraic structure with these elements.}