What is the name of this ring?

Let $\lambda = x^{N+1} + a_1 x^{N-1} + \ldots + a_N$,
$\lambda_x = \frac{d}{dx}\lambda$
Does anyone know the name of the ring $\mathcal{R} = \mathbb{C} \left[ x \right] / <\lambda_x>$ ? Where <lambdax> is all multiples of lambda x and is an ideal.