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A space that refuses to let a line break at it.
Also known as: Hard space, Space that stops a line break
Invisible, and structural. It holds together things that read badly when separated across a line — a number and its unit, a title and a name, the parts of a date — and it is why '10 kg' never ends up with the kg alone at the start of a line.
A space character at which a line may not be broken, holding the words either side of it on the same line.
Used between a number and its unit, between a title and a surname, within a date, and before a French colon or question mark, where a break would leave a fragment stranded at the start of a line.
Indistinguishable from an ordinary space on screen and a frequent cause of failed text matching, because a string that looks identical to another may differ in exactly this character.
Text copied from a web page often carries these invisibly.
A blank gap between two words, the same width as an ordinary space and indistinguishable from one on screen.