Maps where the mapper has sliders in various shapes.
Can be both obvious shapes (circles, hearts), more stylized sliders (the twin swords at the end of Raise my Sword), oddly-shaped sliders (see Algebra [Hard]), or sliders that have unique shapes based on the song (those that have jagged lines in sync with the song.)
Note that simply having a curve or slant does not count, not even semi-circles. A slider that crosses over itself would count, however.