Also known as congruence, congruent transformation
thumb|upright=1.4|A Function composition|composition of two opposite isometries is a direct isometry. A reflection in a line is an opposite isometry, like (reflection w.r.t the center diagonal line) or (reflection w.r.t the right diagonal line) on the image. Translation is a direct isometry: a rigid motion.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).