Google is ELI>5.
I’m guessing re. the physics flair. Happy to be corrected.
In: Physics
In mathematics (and, hence, a lot of physics) isometry means distance preserving. If we have a measure of distance on some space, and we apply a function to transform that space somehow (e.g. by rotating it), then we say that function is isometric if the distance between two points before applying the function to them is the same as after.
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