ISO/IEC 8859-15:1999, Information technology — 8-bit single-byte coded graphic character sets — Part 15: Latin alphabet No.
It is similar to ISO 8859-1, and thus also intended for “Western European” languages, but replaces some less common symbols with the euro sign and some letters that were deemed necessary.
[4][5] The identifier ISO 8859-15 was proposed for the Sami languages in 1996, which was eventually rejected, but was passed as ISO-IR 197.
[6][7][8] ISO 8859-16 was proposed as a similar encoding to today's ISO 8859-15, to replace 11 unused or rarely used ISO 8859-1 characters with the missing French Œ œ (at the same spot as same place as DEC-MCS and Lotus International Character Set) and Ÿ (which was not at the same place as these sets, as Ý was in that spot for Icelandic), Dutch IJ ij, and Turkish Ğ ğ İ ı Ş ş.
The Turkish characters were removed because it was considered that it would potentially do more harm to Turkish then-current practice while UCS (Unicode) implementation was not that far away, and the Dutch IJ ligature was removed as the existing digraph ij was found to be adequate.
One person said "The proposed «+-» is not an adequate fall-back, as this sequence, though rarely used, has already a fixed mathematical meaning, quite different from «±»; and, even if a reader would deduce the intended meaning, «±», from the context, «+-» in lieu of «±» will hurt a physicist's æsthetic feelings at least as much as «oe» in lieu of an o-e ligature a Francophone's.
It did see some use as the default character set for the text console and terminal programs under Linux when the euro sign was needed, but the use of full Unicode was not practical, but this has since been replaced with UTF-8.
Also, this encoding does not provide the correct character for the apostrophe, and oriented single high quotation marks, although some texts use the spacing grave accent and spacing acute accent, which are both part of ISO 8859-1, instead of the 6-shaped/9-shaped quotations marks or apostrophes (and this works reliably with some font styles, where all these characters are displayed as slanted wedge glyphs).