Level of a Hilbert modular form (reviewed)

Given a Hilbert modular form $f$ that is defined in terms of the totally real number field $F$, the level of $f$ is a nonzero ideal $\mathfrak{N}$ of the ring of integers $\Z_F$ of $F$ that determines the group $\Gamma_0(\mathfrak{N})$ under which $f$ transforms. In the LMFDB, such an ideal $\mathfrak{N}$ is identified by a label.

The level norm is the absolute norm of the level of the form.