meaning - What is the definition of non-ladder or non-run

I found this word in a dictionary (my native language to English), but I cannot find it in any English one.

Why Focusing on Equity, Not Just Equality., Is Good for Everyone, Zebra Blog

Ladder Diagram (LD) Programming Contacts and Coils, Basics of Programmable Logic Controllers (PLCs)

D2R ladder or non ladder? : r/Diablo

A Section of Border Wall in Texas Cost $27 Million a Mile. It's Being Foiled by $5 Ladders. – Texas Monthly

meaning - What is the definition of non-ladder or non-run? - English Language Learners Stack Exchange

American National Standard for Ladders — Portable Metal — Safety Requirements

Nonfunctional Requirements: Examples, Types and Approaches

How to Choose an Attic Ladder

What are Tempo Runs and Why Will They Help My Running? - Runners Connect