geometrical stair
<blank" >target="_blank" >figure class="wp-block-image size-full">A winding or glossary/angled-stair/" class="glossaryLink" data-cmtooltip="05e4c63baae1c57a584f14ad0a931651" target="_blank" >angled stair having no newels at the turning points. (Phillips, 1994)
geometrical staircase
