helix stair

spiral stair, caracole, circular stair, cockle stair, corkscrew stair, spiral staircase

spiral stair
A flight of stairs, circular in plan, whose treads wind around a central newel. Also called a helical stair, solid newel stair.
References in periodicals archive ?
Kalimex's work opened the access within the Statue of Liberty ensuring visitor's safe ascent up the famous double helix stair and within the crown observation level.
From the top level of the pedestal, visitors can view the double helix stairs leading to the Statue's crown as well as the support system designed by renowned French architect and engineer Gustave Eiffel.
From the top level of the pedestal, visitors can look up and view the double helix stairs leading through the interior of the Statue to the crown as well as the support system designed by renowned French architect and engineer Gustave Eiffel.