Greek Small Letter Archaic Sampi at U+0373 is a lowercase Greek letter in the Greek and Coptic block, used for the early alphabetic sign known as archaic sampi. It represents a historical Greek character rather than a letter used in modern Greek spelling. Its main use is in scholarly editions, epigraphy, papyrology, and digital transcriptions of ancient Greek inscriptions or manuscripts where this specific archaic form appears. Editors may use it when reproducing local alphabetic writing from regions such as Ionia, where sampi-like signs occurred before the later standard Greek alphabet settled. It is also relevant in linguistic and historical discussions of Greek letter development, especially when distinguishing archaic sampi from the later numeral sampi used in Greek numerals for 900. Because the character is specialized, it is most often encountered in academic databases, critical apparatuses, fonts for classical studies, and Unicode test or reference material. Font coverage is less consistent than for ordinary Greek letters, and it can be confused with other sampi forms if a text substitutes a lookalike instead of the intended archaic lowercase character.