Pagename: render/shader_nodes/vector/vector_rotate
Rotation units not specified but 2.90 appears to use radians.
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Description
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The node uses radians or degrees depending on the "Rotation" unit: https://docs.blender.org/manual/en/dev/scene_layout/scene/properties.html#units
This is visible in the UI with the degree symbol in degree mode and the lack of radian mode.
The general principle is explained here: https://docs.blender.org/manual/en/2.93/interface/controls/buttons/fields.html#units