One ladder - Ipponbashigo

..."Hashinoko" originally referred to a crosspiece between the ends of a ladder, but it is thought that this eventually came to refer to the entire ladder, and the act of setting up a ladder was also called "hashitate." There are several types of ladders, including a single ladder (gangi ladder), a two-pronged ladder, a rope ladder, a folding ladder, and a stick ladder. A single ladder is also called "kizahashi," and in Okinawa it is simply called "hashi."...

*Some of the terminology explanations that mention "single ladder" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…〈はしのこ〉は端と端の間に渡した横木を指したが，これがいつしか梯子全体を指すようになったと思われ，梯子を立てることを梯立（はしたて）ともいった。梯子の種類には一本梯子(雁木（がんぎ）梯子)，二また梯子，縄梯子，折りたたみ梯子，棒梯子などがある。一本梯子は〈きざはし〉とも呼び，沖縄では単に〈はし〉ともいう。…

※「一本梯子」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報