For a misspecified model $f(x|\theta)$, the M-estimator satisfies $\sum_{i=1}^n \psi(X_i, \hat{\theta}) = 0$. The asymptotic variance of $\sqrt{n}(\hat{\theta} - \theta^*)$ is given by $A^{-1} B A^{-1}$, where $B$ is the variance of the estimating function. What is the standard notation for this information matrix?