What are these called?

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What are these tabs called in Python? Where for example you’d click tab 2 and then maybe there are a bunch of different operators listed there. Not specific to context or anything.

I’ve been Googling like crazy but I have feeling it’s called something other than “tabs”, which is maybe why I can’t find it…

Those are EnumProperties. Blender’s api doesn’t have a concept of “tabs”, but addon developers use EnumProperties as stand-ins for them, and then write custom code depending on the state of the EnumProperty