Anchor

yes yes i know there is an anchor in XCS but let's just make one ourselves 

create a circle
then a long rectangle 
and a small one across it
mark everything and center align 
select the small rectangle and edit node
create 2 new nodes in the center and move them away from the center
this gives us a more interesting shape
we also do this with the long rectangle so that it runs together conically

first 2 triangles and this one to the left and right of it
now comes the somewhat more difficult part
with the path tool we create a shape and adjust it