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Non-breaking space (°) is a space character that prevents an automatic line break at its position. Pilcrow (¶) is the symbolic representation of paragraphs. Line break (↵) breaks the current line without new paragraph. It puts lines of text close together. Tab character (→) is used to align text horizontally to the next tab stop.
In computing and telecommunications, a control character or non-printing character (NPC) is a code point in a character set that does not represent a written character or symbol. They are used as in-band signaling to cause effects other than the addition of a symbol to the text.
Add the template to the table caption, and then only screen reader users will see it. Example: |+ {{sro|Table caption}} For current table caption and summary guidelines see the w3.org page: Caption & Summary, in Tables Tutorial. Web Accessibility Initiative (WAI). The summary info in the paragraph below is out of date:
ICANN rules prohibit domain names from containing non-displayed characters, including the zero-width space, and most browsers prohibit their use within domain names because they can be used to create a homograph attack, where a malicious URL is visually indistinguishable from a legitimate one. [3] [4]
In a broader sense, other non-printing format characters, such as those used in bidirectional text, are also referred to as control characters by software; [2] these are mostly assigned to the general category Cf (format), used for format effectors introduced and defined by Unicode itself.
Before computers were invented, and thus becoming computerized (or digital) typesetting, font sizes were changed by replacing the characters with a different size of type. In letterpress printing, individual letters and punctuation marks were cast on small metal blocks, known as "sorts," and then arranged to form the text for a page.
To prevent two words from becoming separated by a linewrap (e.g. Mr. Smith or 400 km/h) a non-breaking space, sometimes also called a "non-printing character", may be used between them. (For three or more words, the template {{ nowrap }} is probably more suitable.)
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;