U+1FBF "᾿" Greek Psili Unicode Character

U+1FBF "᾿" Greek Psili is a historic diacritical mark used in ancient and polytonic Greek writing, where it originally signified a "smooth" or "lenis" breathing, indicating that a vowel or rho beginning a word should be pronounced without an initial "h" sound, in contrast to the rough breathing mark used for aspiration. Visually resembling a small comma or apostrophe placed above the initial letter, this character is now primarily employed in scholarly texts, liturgical works, and modern typography that aims to faithfully reproduce classical Greek orthography, though it has largely fallen out of use in standard modern Greek.