  Fundamental block and staggered orders of magnetic Fe multipoles in Na2FeSe2
are classified by their symmetry and magnetoelectric properties. Our structure
model incorporates ferromagnetic or antiferromagnetic coupling between chains.
The ferrate salt is valued in studies of highly correlated electrons as the
only iron selenide known to possess chain-like structural units hosting ferrous
cations. Axial and polar (Dirac) multipoles are compulsory in the electronic
structure since Fe ions exhibit enantiomorphic symmetry in the parent
K2ZnO2-type compound. Calculated Bragg diffraction patterns for neutrons and
x-rays reveal specific contributions from both multipole types.
