Dotted and dotless I

"Dotted I" redirects here. For the Cyrillic letter, see Dotted I (Cyrillic).
Dotless and dotted I's in capital and lower case.

The Turkish alphabet, which is a variant of the Latin alphabet, includes two distinct versions of the letter I, one dotted and the other dotless.

The dotless I, I ı, denotes the close back unrounded vowel sound (/ɯ/). Neither the upper nor the lower case version has a dot.

The dotted I, İ i, denotes the close front unrounded vowel sound (/i/). Both the upper and lower case versions have a dot.

Examples:

In contrast, the letter j does not have this distinction, with a dot only on the lower case character: J j.

In scholarly writing on Turkic languages, ï is sometimes used for /ɯ/.[1]

Consequence for ligatures

In some fonts, if the lowercase letters "fi" are placed adjacently, the dot-like upper end of the "f" would fall inconveniently close to the dot of the "i", and therefore a ligature glyph is provided with the top of the "f" extended to serve as the dot of the "i". A similar ligature for "ffi" is also possible. Since the unligatured forms are unattractive and the ligatures make the "i" dotless, such fonts are not appropriate for use in a Turkish setting. However, the fi ligatures of some fonts do not merge the letters and instead space them next to each other, with the dot on the i remaining. Such fonts are appropriate for Turkish, but the writer must be careful to be consistent in the use of ligatures.

In computing

Character I i İ ı
Unicode name LATIN CAPITAL LETTER I LATIN SMALL LETTER I LATIN CAPITAL LETTER
I WITH DOT ABOVE 		LATIN SMALL LETTER
DOTLESS I
Encodings decimal hex decimal hex decimal hex decimal hex
Unicode 73 U+0049 105 U+0069 304 U+0130 305 U+0131
UTF-8 73 49 105 69 196 176 C4 B0 196 177 C4 B1
Numeric character reference I I i i İ İ ı ı
ISO 8859-9 73 49 105 69 221 DD 253 FD
ISO 8859-3 73 49 105 69 169 A9 185 B9

In normal typography, when lower case i is combined with other diacritics, the dot is generally removed before the diacritic is added; however, Unicode still lists the equivalent combining sequences as including the dotted i, since logically it is the normal dotted i character that is being modified.

Most Unicode software uppercases ı to I and lowercases İ to i, but, unless specifically set up for Turkish, it lowercases I to i and uppercases i to I. Thus uppercasing then lowercasing, or vice versa, changes the letters.

In the Microsoft Windows SDK, beginning with Windows Vista, several relevant functions have a NORM_LINGUISTIC_CASING flag, to indicate that for Turkish and Azerbaijani locales, I should map to ı and i to İ.

In the LaTeX typesetting language the dotless i can be written with the backslash-i command: \i. The İ can be written using the normal accenting method (i.e. \.{I}).

Dotless i (and dotted capital I) is handled problematically in the Turkish locales of several software packages, including Oracle DBMS, PHP, Java (software platform),[2][3] and Unixware 7, where implicit capitalization of names of keywords, variables, and tables has effects not foreseen by the application developers. The C or US English locales do not have these problems. The .NET Framework has special provisions to handle the 'Turkish i'.[4]

Many cellphones available in Turkey (as of 2008) lack a proper localization, which leads to replacing “ı” by “i” in SMS, sometimes severely distorting the sense of a text. In one instance, a miscommunication played a role in the deaths of Emine and Ramazan Çalçoban in 2008.[5][6] A common substitution is to use the character 1 for dotless ı.

Implications for casing

The casing of the dotless and dotted I forms differ from other languages. That implies that a case insensitive matching expected by an English person doesn't match the expectations of a Turkish user. The "Turkish I" is often used as an example of the problems with case insensitivity in computing.

Usage in other languages

Dotted and dotless "i" are used in several other writing systems for Turkic languages:

The dotless "i" may also be used as a stylistic variant of the dotted "i", without there being any meaningful difference between them. This is common in Irish, for example. See Tittle.

See also

Notes

  1. ↑ Marcel Erdal, A Grammar of Old Turkic, Handbook of Oriental Studies 3, ISBN 9004102949, 2004, p. 52
  2. ↑ Turkish Java needs special brewing
  3. ↑ The Policeman’s Horror: Default Locales, Default Charsets, and Default Timezones
  4. ↑ MSDN: Writing Culture-Safe Managed Code: The Turkish Example
  5. ↑ Diaz, Jesus (2008-04-21). "A cellphone's missing dot kills two people, puts three more in jail". Gizmodo. Retrieved 2015-08-28.
  6. ↑ Orion, Egan (2008-04-26). "Cellphone localisation glitch turned deadly in Turkey – dotted "i" leads to tragedy]". The Inquirer. Retrieved 2015-08-28.
  7. ↑ Government of Kazakhstan (Kazakh Cyrillic/Latin)
  8. ↑ KazInform (Kazakh Cyrillic/Latin)

References

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