Fundamental parallelogram of a period lattice
= Fundamental parallelogram of a period lattice
= Fundamental parallelogram
{synonym}
A fundamental parallelogram for $\Lambda=\mathbb Z\omega_1+\mathbb Z\omega_2$ is a translate of
$$
\{s\omega_1+t\omega_2:0\leq s,t<1\}.
$$
Its translates tile the <complex plane>.