anisotropy
Physics term describing a property that varies with direction, as opposed to isotropy (等方性).
See also: 等方性
This crystal has strong anisotropy, so its hardness differs depending on the direction.
fractional anisotropy; FA
Compound of 異 (different) + 方 (direction) + 性 (property). The term is a direct translation of the English 'anisotropy'.