The best replacement for circles is squares.

The best alternatives to circles are rated as following:
★★★★★  squares
★★★  roundabouts
★★  guided reading
★★  book clubs
★★  ellipses
★  traffic lights
★  spiral
★  stalls
★  quality improvement
★  spirals
★  straight lines
  facebook groups
  triangles
  mars rover

Your alternative for circles is not listed? Suggest!
Speaking about circles, one probably shouldn't forget about angles.

Other search terms related to circles and their ratings are:
★★★★★ angles
★★★★★ common tangents
★★★ tangents
★ 3 common tangents
designs
You have in mind a companion for circles and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of circles in all years. Click on graph for more.
circles
squares
roundabouts