Curves
Deltoid (3-cusp)
Three-cornered and parameter-free, this is the tricuspid outline behind cam-follower diagrams and threefold logo marks that have to be geometrically exact.
FamilyCurves
Parametersnone, handles only
On canvas handlesno, adjust it in the panel
Destructiveno, the original path is kept
LicenceFree for commercial use
How you adjust it
Nothing here is baked in. Every value stays live on the object for as long as the file exists, so you can come back and retune it, reorder it against other effects, or take it off and get your original path back exactly as you drew it.
This one has no panel controls at all. It is shaped entirely by dragging its handles on the artwork, which is why it has none to list.