Radius, a measure of the curvature of a stringed instrument's fingerboard

RADIUS, a network authentication protocol

Radius of curvature, a measure of curvature in advanced mathematics

Radius (computer), a computer hardware firm

Radius (bone), one of the two bones in a forearm

A radius is a straight line from the center to the boundary of a geometric object, especially a circle, sphere, or disk. Radius may also refer to:

Bend radius

Bend radius or minimum bend radius, the minimum radius one can bend a pipe, tube, sheet, cable or hose without damage