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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.
Clicking the arrow to the left of Special characters above the edit window opens a list of groups of images of special characters (see Figure 1 below); clicking again on the arrow (which now points down) closes the list. Click on a group name (e.g., Symbols) to display that group; click on the image of the appropriate character to enter that ...
Unicode characters are distinguished by code points, which are conventionally represented by "U+" followed by four, five or six hexadecimal digits, for example U+00AE or U+1D310. Characters in the Basic Multilingual Plane (BMP), containing modern scripts – including many Chinese and Japanese characters – and many symbols, have a 4-digit code.
The hardware code page of the original IBM PC supplied the following box-drawing characters, in what DOS now calls code page 437. This subset of the Unicode box-drawing characters is thus included in WGL4 and is far more popular and likely to be rendered correctly:
The HTML codes can be used where a literal character would cause confusion, such as using code "[" or "]" to show the left or right square bracket ('[' or ']'). Some editors, upon seeing a single bracket '[' at a word will edit a page to put double-bracket '[[' as thinking a single bracket must be an obvious typo, but an HTML code of ...
Miscellaneous Symbols is a Unicode block (U+2600–U+26FF) containing glyphs representing concepts from a variety of categories: astrological, astronomical, chess, dice, musical notation, political symbols, recycling, religious symbols, trigrams, warning signs, and weather, among others.
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Many Unicode characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation. For example, the null character (U+0000 NULL) is used in C-programming application environments to indicate the end of a string of characters.