# Why counterclockwise encirclements of -1?

Secondly, why -1? That's because we want the number of RHP zeros of ${\displaystyle 1+L(s)}$. If we wanted to find the number of RHP zeros of the plain loop transfer function ${\displaystyle L(s)}$ (for instance), we would count the number of encirclements of the origin, or if we wanted the number of RHP zeros of ${\displaystyle 2+L(s)}$, we would count the number of encirclements of -2, but these aren't what we're interested in.