"Perfect symmetry" means that something is exactly the same on both sides, like a mirror image or a balanced arrangement.
Sentences with «perfect symmetry»
What is striking is the absolutely perfect symmetry of the views in both directions. (si.com)
So though externally i looked to be in perfect symmetry, my global muscles were getting further and further ahead of my small little internal supporting muscles. (scoobysworkshop.com)
There's very few people with perfect symmetry and even ability to develop every muscle. (completehumanperformance.com)