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Non-printing characters or formatting marks are characters for content designing in word processors, which are not displayed at printing. It is also possible to customize their display on the monitor. The most common non-printable characters in word processors are pilcrow, space, non-breaking space, tab character etc. [1] [2]
Space (punctuation) § Non-breaking space, for applications; Zero-width space – Special character in text processing, a non-spacing break; Widows and orphans – In typography, an isolated line of text starting/ending a page; Non-printing character in word processors – Formatting marks for content design; Typographic alignment § Justified
The zero-width space can be used to mark word breaks in languages without visible space between words, such as Thai, Myanmar, Khmer, and Japanese. [ 1 ] In justified text, the rendering engine may add inter-character spacing, also known as letter spacing, between letters separated by a zero-width space, unlike around fixed-width spaces.
The word joiner replaces the zero-width no-break space (ZWNBSP, U+FEFF), as a usage of the no-break space of zero width. The ZWNBSP is originally and currently used as the byte order mark (BOM) at the start of a file. However, if encountered elsewhere, it should, according to Unicode, be treated as a word joiner, a no-break space of zero width.
no-break space: U+00A0: 160 No: No Common: Latin-1 Supplement: Separator, space Non-breaking space: identical to U+0020, but not a point at which a line may be broken. HTML/XML named entity: ,  , LaTeX: ~ ogham space mark: U+1680: 5760 Yes: No Ogham: Ogham: Separator, space Used for interword separation in Ogham text ...
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
A Unicode character is assigned a unique Name (na). [1] The name is composed of uppercase letters A–Z, digits 0–9, hyphen-minus and space.Some sequences are excluded: names beginning with a space or hyphen, names ending with a space or hyphen, repeated spaces or hyphens, and space after hyphen are not allowed.
Commonly occurring abbreviations (or acronyms) for control codes, format characters, spaces, and variation selectors. There are 354 such aliases, including 256 aliases for variant selectors (VS-1 ... VS-256). For example, U+00A0 NO-BREAK SPACE has alias NBSP. Presentation: in the code charts, the abbreviation is shown in a dashed box: