2.31 centimeters is equal to 0.909 inches.
This measurement is approximately the size of a penny (2.5 cm), a AAA battery (2.53 cm), and the width of a standard paperclip (2.54 cm). It is slightly smaller than the diameter of a quarter (2.6 cm) and a golf ball (4.27 cm). It is also slightly larger than the width of a regular postage stamp (1.96 cm).