mP  Monoclinic primitive
oP  Orthorhombic primitve
tP  Tetragonal primitive
hP  Hexagonal primitive (also hcp)
hR  Rhombohedral primitive
cP  Cubic primitive
cI  Cubic body centred
cF  Cubic face centred

Missing icons
tI  Tetragonal body centred
oS  Orthorhombic single face centred
oI  Orthorhombic body centred
oF  Orthorhombic all faces centred
mS  Monoclinic centred
aP  Triclinic