I'm trying to learn a bit about interiors in the CS, and now I'm doing a guide where I'm supposed to put the North Marker in a room. It says it should be in the Object Window > World Objects > Static. There's nothing there called North Marker. Help please?

Yes, there is, and it is called 'NorthMarker'.

I found it. I thought it would be in the left-hand column, not the right hand.

Problem solved.