| | normal curve, bell-shaped curve, Gaussian curve, Gaussian shape; meander; closed curve; S-shape; catenary; Cupid's bow; wave, undulation; extrados; gooseneck; intrados; bend, crook, turn; hook, crotchet; envelope; arc; scallop, crenation, crenature, crenel, crenelle; spiral; helix, spiral; perversion; sinuosity, sinuousness; arch; bell, bell shape, campana; bow, arc; crescent; quadric, quadric surface; roulette, line roulette |