  We review the concept of chirality, at first briefly in a general context
then in the specific framework of the spin networks. We next discuss to what
extent neutron scattering appears as an unconvertible tool to probe magnetic
chirality in the static and dynamical regimes of the spins. The remarkable
chiral ground state and excitations of the Fe-langasite compound finally serves
to illustrate the use of neutron polarimetry in the experimental studies of the
magnetic chirality.
