Obscure Rhino commands

Which Rhino commands do you think are among the more obscure? If possible post a link to the Help page for the command. Command Quick Reference | Rhino 3-D modeling (mcneel.com)

My first one is RevCloud. I had not heard of it until it was mentioned today in a now deleted post. I don’t recall seeing it mentioned previously.
https://docs.mcneel.com/rhino/8/help/en-us/index.htm#commands/revcloud.htm

The RevCloud command draws a revision cloud polycurve.

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