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Fallback font
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<p> A fallback <a href="/facts/Typeface/It41hIjl">font</a> is a reserve typeface containing symbols for as many <a href="/facts/Unicode/DDu3MfPV">Unicode</a> <a href="/facts/Grapheme/uzXGIsAr">characters</a> as possible. When a display system encounters a character that is not part of the repertoire of any of the other available fonts, a symbol from a fallback font is used instead. Typically, a fallback font will contain symbols representative of the various types of Unicode characters. This should not be confused with a <a href="/facts/Unicode_font/Br34KXKc">Unicode font</a>, which contains a large number of glyphs that actually contain the existing Unicode characters themselves for a large number of characters, such as <a href="/facts/GNU_Unifont/I9S5eXEx">GNU Unifont</a>. </p><p>Systems that do not offer a fallback font typically display black or white rectangles, <a href="/facts/Question_mark/0D8z1rxr">question marks</a>, the <a href="/facts/Unicode_Replacement_Character/FaU4XUT2">Unicode Replacement Character</a> (U+FFFD), or nothing at all, in place of missing characters. Placing one or more fallback fonts at the end of a list of preferred fonts ensures that there are no missing characters. </p>