Wirebook › Glossary › Non-breaking space
What is a non-breaking space?
In one sentence: A space that looks ordinary but uses a different number (U+00A0), so computers treat it as different from a normal space and usually will not wrap a line there.
A little more
A non-breaking space (U+00A0) looks just like the ordinary space from the space bar (U+0020), but it is a different number. Programs use it to keep two words on the same line, for example between a number and a unit.
Because it looks identical, it is a classic trap in filenames, passwords and copied config. A search for a normal space will miss it, and two paths that look the same will not match.
It's a bit like… Two twins in identical coats: you can't tell them apart by eye, but their ID numbers are different.