Atomic symbols are set by this tag. This tag is not essential for phonon calculation and is used by mode2anime.rb. Required number of names are determined by POSCAR file. If two distinguished ion species are written in POSCAR, you need to set two names. However, if atom names are written in line 6 of POSCAR,
ATOM_NAMEtag is ignored and the POSCAR information takes priority.
ATOM_NAME = Sn O