The four standard competitive swimming styles recognized in international aquatic sports.

Eight common dental hand instruments arranged in a grid.

The main structural, mechanical, and operational components of a standard hammerhead tower crane.

Solving equations

Six common artist paintbrush head shapes arranged in a comparison grid.

The principal structural components and tailoring features of a standard tailored garment.

The four classical centres of concurrency in a triangle: centroid, circumcentre, incentre, and orthocentre.

Unfolded two-dimensional nets corresponding to six fundamental three-dimensional geometric solids.