Thi

Thi is a three-letter sequence that appears in many languages and fields. It does not denote a single concept, but serves as a component in personal names, transliteration, and scientific terminology.

In Vietnamese naming practices, Thi (often written with the diacritic as Thị) is a common feminine middle name. It accompanies various given names and surnames; notable bearer Nguyen Thi Minh Khai (1908–1941) is among the historical figures frequently cited in studies of Vietnamese history.

In chemistry, thi- or thio- is a prefix indicating sulfur-containing groups or substitutions, derived from the Greek theion meaning sulfur. It appears in terms such as thiolate, thiol, thiourea, and thioether. The form 'thi' is commonly seen at the beginning of these words and in related nomenclature.

In linguistics and language technology, 'thi' may appear as a syllable or transliteration unit in various scripts, and can occur as a component of longer words or transcriptions.

Beyond these uses, thi functions as an acronym or code in diverse domains. Its meaning is highly context-dependent.