Hi Rhino! 
Command: _OneView
When I use the oneview command,
What do ( 
) parentheses mean?
That is the view label telling what cplane is active. The parentheses means the current view is not close to cplane orientation. Rotate the viewport so you are looking from the top, you’ll notice the parentheses disappear.
https://docs.mcneel.com/rhino/6/help/en-us/index.htm#commands/oneview.htm?Highlight=oneview
Thank you for reply 