(adsbygoogle = window.adsbygoogle || []).push({}); "Generator of rotations"...rotations of WHAT?

The angular momentum operator is defined as the "generator of rotations." Fine. But rotations ofWHAT? What's being rotated? The wave function (doesn't make sense; isn't the wave function a scalar), perhaps? An arbitrary vector in the coordinate system under investigation?

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# Generator of rotations rotations of WHAT?

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