Question 347581
Which asymptote do you mean? 
The x-axis?
.
.
.
If that's what you're asking, the answer is infinitely many.
The solutions to {{{sin(x)/x=0}}} are {{{x=n*pi}}} for any integer {{{n}}}.
.
.
.
{{{graph(300,300,-20,20,-2,2,sin(x)/x)}}}