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“Foreign language characters” is an informal, context-dependent phrase for written characters used in a language other than the one assumed in a conversation. It is not a formal Unicode category. In a technical explanation, name the character or script—or specify a boundary such as “outside ASCII”—instead of treating “foreign” as an intrinsic property.
What does “foreign language characters” mean?
The phrase usually refers to writing a reader considers unfamiliar because it belongs to a language or writing system different from the one under discussion. That judgment depends on context: a character can be ordinary in one language and unfamiliar to someone reading another. Unicode is designed to represent multilingual text; it does not divide characters into “native” and “foreign” classes.
For example, ñ is part of ordinary Spanish spelling, and Arabic letters are ordinary in Arabic script. Japanese hiragana is not “special” to Japanese writing. These characters may be unfamiliar to some readers, but unfamiliarity does not define what they are.
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Language and script
A language is not the same thing as a script, or writing system. A script can be used by multiple languages, and a language can use more than one script. Characters may also be shared across languages. Unicode gives the Latin letter Y as an example: it is the same encoded character whether called i grec in French, ypsilon in German, or wye in English. See the Unicode Standard, Version 17.0.0, Chapter 2.
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Character and glyph
A character is an abstract unit of written text; a glyph is the visual form used to render it. One character may have different glyph forms depending on font or context, and similar-looking glyphs may represent different characters. Appearance alone therefore may not establish a character’s identity or language.
Are foreign language characters the same as non-ASCII characters?
No. Non-ASCII is a technical term for characters outside ASCII’s repertoire, not a label for foreign, unusual, or non-English writing. As RFC 6365 explains, “The term "non-ASCII" strictly refers to characters other than those that appear in the ASCII repertoire, independent of the CCS or encoding used for them.”
That means familiar accented letters such as é can be non-ASCII, even when used in French, while characters in non-Latin scripts are also outside ASCII. The distinction is about membership in a defined technical repertoire, not about a reader’s language. The IETF’s RFC 6365 sets out this terminology.
What do Unicode code points and encodings do?
Unicode provides a coded repertoire for representing text. A Unicode code point is a number assigned to an element in that repertoire, conventionally written with a U+ prefix; for example, U+0041 represents “A.” UTF-8, UTF-16, and UTF-32 are encoding forms that represent Unicode code points in computer data. An encoding changes how text is represented in bytes; it does not turn a character into a foreign or native one.
When text is exchanged or stored, the encoding must support the characters being represented. The Unicode Consortium’s Technical Introduction describes Unicode as “the universal character encoding standard used for representation of text for computer processing.” For encoding-form details, see its FAQ on UTF-8, UTF-16, UTF-32, and BOM.
Why might text look wrong on a screen?
A display problem involving unfamiliar or unreadable text does not, by itself, identify the cause. Separate the layers involved:
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- Character data and encoding: Check whether the text was decoded using the encoding intended by the source. Incorrect decoding can produce corrupted text.
- Font coverage: A font may lack a glyph for a character, even when the character data is intact.
- Shaping and direction: Some scripts require contextual shaping or right-to-left handling. Applications need to implement the relevant text behavior.
Unicode represents text, but does not automatically provide every language-specific convention, such as sorting rules or text boundaries. Those behaviors depend on application processing. The Unicode Consortium discusses this distinction in its FAQ on internationalization and Unicode. Diagnose the relevant layer rather than assuming that the text is an unsupported “foreign character.”
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What is a more precise term to use?
Choose wording that says what you actually mean. “Foreign language characters” may work informally when the context makes the language clear, but it is ambiguous without that context.
Quick Recap
- Name the character, such as
éorñ, when discussing a specific written symbol. - Name the script, such as Latin or Arabic, when the writing system is relevant.
- Say “non-ASCII characters” when you mean characters outside ASCII, regardless of language.
- Say “Unicode characters” when discussing characters in Unicode’s repertoire, or specify UTF-8, UTF-16, or UTF-32 when the encoding form matters.
- Avoid “special characters” unless you define it: people use that phrase for punctuation, symbols, diacritics, keyboard limitations, or characters outside basic ASCII.
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