low-index plane
the smallest values of integers (the symbols h, k, l) proportional to the reciprocals of the intercepts of the plane on the three crystal axes; these planes are planes of the highest density of atoms (see: Miller indices, Miller-Bravais indices), vähimate võimalike täisarvuliste väärtustega (Milleri indeksitega h, k, l) tasandid kristallivõres, milliseid iseloomustab aatomite suurim pakketihedus (vt Milleri indeksid, Miller-Bravais indeksid)