ISO885911

ISO/IEC 8859-11, commonly referred to as ISO8859-11, is part of the ISO/IEC 8859 family of single-byte character encodings designed to cover the Thai language. Like other encodings in the 8859 series, it uses the ASCII range 0x00-0x7F for standard Latin letters and punctuation; the 0x80-0x9F range is generally reserved for control codes, and the remaining code points, 0xA0-0xFF, are allocated to Thai letters, numerals, vowels, tone marks, and script-specific punctuation. This arrangement allows basic Thai text to be represented in a single-byte form without a multi-byte encoding, which was useful for older systems and documents predating Unicode.

In practice, ISO8859-11 saw limited adoption compared with Thai-centric encodings such as TIS-620, and in modern contexts it has largely been superseded by Unicode. Consequently, ISO8859-11 is mostly encountered today in legacy data, legacy software, or environments that still require a legacy 8-bit encoding. When present in software or on the web, the encoding is typically labeled as ISO-8859-11 or ISO8859-11, but support can be inconsistent compared with Unicode, and fonts or rendering may vary.

Overview: ISO8859-11 is a Thai-oriented member of the ISO/IEC 8859 family, defined to map Thai characters into the upper portion of the code table while leaving the ASCII range intact. Its usage has diminished in favor of Unicode, which provides comprehensive, consistent support for Thai script alongside other languages.