crystal system

A crystal system is a category of space groups, which characterize symmetry of structures in three dimensions with translational symmetry in three directions, having a discrete class of point groups. A major application is in crystallography, to categorize crystals, but by itself the topic is one of 3D Euclidean geometry.
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Definition

B: (Fisika) sistem hablur
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Eng: crystal system
Urdu: قلموں کا نِظام اشکال ۔ اپنی شکلوں کے اِختیار سے قلمیں سات مُختَلِف زمروں میں تقسیم کی جاتی ہیں ۔