The non-breaking hyphen (‑): keeps 555-0134 on one line

The non-breaking hyphen (‑, U+2011) is the hyphen you want whenever a line break would do damage. It looks like an ordinary hyphen in every font, sits in the same place and reads the same way — but it tells the layout engine that the two halves of the word must not be separated, so a word processor will sooner push the whole token onto the next line than break at that dash. In a phone number that means 555-0134 stays intact instead of becoming “555-” at the end of one line and “0134” at the start of the next, which is a courtesy number that leads nowhere. The same logic applies to part numbers, serial codes, account references and hyphenated surnames.

The character also fixes a quieter problem in typeset text: line-breaking. Most editors break lines at a hyphen as readily as at a space, which is how you end up with “well-” stranded at the end of a measure. A non-breaking hyphen prevents that break, so compound words and codes hold together as a single visual unit. In print and typography the character has been standard practice for a century; in HTML it is written as a numeric character reference, because no named entity exists for it. In word processors you insert it with a shortcut rather than a key.

The usual reason people meet this character is not to insert one but to remove one. Because it is invisible in ordinary text and cannot be typed into a search box, a pasted document can carry dozens of them unnoticed, and they then break the things you would not expect: a fuzzy search that cannot match “555-0134”, a duplicate check that sees two identical phone numbers as different strings, a CSV import that chokes on a non-ASCII byte, or a form that rejects a name it has accepted a thousand times before. The hyphen remover on this site matches U+2011 by code point and normalises it in one pass.