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Private Use Areas
In Unicode, a Private Use Area (PUA) is a range of code points that, by definition, will not be assigned characters by the Unicode Consortium.〔Unicode Consortium. (Glossary of Unicode Terms: "Private Use Area (PUA)" )〕 Currently, three private use areas are defined: one in the Basic Multilingual Plane (U+E000–U+F8FF), and one each in, and nearly covering, planes 15 and 16 (U+F0000–U+FFFFD, U+100000–U+10FFFD). The code points in these areas cannot be considered as standardized characters in Unicode itself. They are intentionally left undefined so that third parties may define their own characters without conflicting with Unicode Consortium assignments. Under the Unicode Stability Policy,〔(【引用サイトリンク】title=Unicode Character Encoding Stability Policy )〕 the Private Use Areas will remain allocated for that purpose in all future Unicode versions.
Assignments to Private Use Area characters need not be "private" in the sense of strictly internal to an organisation; a number of assignment schemes have been published by several organisations. Such publication may include a font that supports the definition (showing the glyphs), and software making use of the private-use characters (e.g. a graphics character for a "print document" function). By definition, multiple private parties may assign different characters to the same code point, with the consequence that a user may see one private character from an installed font where a different one was intended.
==Definition==
Under the Unicode definition, code points in the Private Use Areas are assigned characters—they are not noncharacters, reserved, or unassigned. Their category is "Other, private use (Co)", and no character names are specified. No representative glyphs are provided, and character semantics are left to private agreement. Private-use characters are assigned Unicode code points whose interpretation is not specified by this standard and whose use may be determined by private agreement among cooperating users. These characters are designated for private use and do not have defined, interpretable semantics except by private agreement.
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No charts are provided for private-use characters, as any such characters are, by their very nature, defined only outside the context of this standard.〔(Unicode Standard chapter 16.5 ) Private Use characters〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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