U+FE99 "ﺙ" Arabic Letter Theh Isolated Form Unicode Character

U+FE99 "ﺙ" Arabic Letter Theh Isolated Form is a presentation form of the Arabic letter "theh" (ث), which is the fourth letter of the Arabic alphabet and represents the voiceless dental fricative sound "th" as in the English word "thin." This specific codepoint belongs to the Arabic Presentation Forms-B block and is used primarily for compatibility with legacy text encodings, as it depicts the letter in its isolated form, which occurs when it appears alone or at the end of a word after a non-connecting character. In modern Unicode text, the standard Arabic letter "ث" (U+062B) is preferred, but U+FE99 ensures correct visual rendering in systems that rely on older font or processing technologies.