C2 or a derivative (C-2, C2, etc.) may refer to:
C2 or a derivative (C-2, C2, etc.) may refer to:
==Mathematics and physics== C2, one of the common notations for the cyclic group of order 2 C2 differentiability class C2 or \Complex^2, the complex coordinate plane c2 the square of the speed of light (in the mass–energy equivalence formula) C2 (space group), three-dimensional space group number 5
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).