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A bilingual sign (or, by extension, a multilingual sign) is the representation on a panel (sign, usually a traffic sign, a safety sign, an informational sign) of texts in more than one language. The use of bilingual signs is usually reserved for situations where there is legally administered bilingualism (in bilingual regions or at national borders) or where there is a relevant tourist or commercial interest (airports, train stations, ports, border checkpoints, tourist attractions, international itineraries, international institutions, etc.). However, more informal uses of bilingual signs are often found on businesses in areas where there is a high degree of bilingualism, such as tourist venues, ethnic enclaves and historic neighborhoods. In addition, some signs feature synchronic digraphia, the use of multiple writing systems for a single language.
Bilingual signs are widely used in regions whose native languages do not use the Latin alphabet (although some countries like Spain or Poland use multilingual signs); such signs generally include transliteration of toponyms and optional translation of complementary texts (often into English). Beyond bilingualism, there is a general tendency toward the substitution of internationally standardized symbols and pictograms for text.