U+1F9C "ᾜ" Greek Capital Letter Eta with Psili and Oxia and Prosgegrammeni Unicode Character

U+1F9C "ᾜ" Greek Capital Letter Eta with Psili and Oxia and Prosgegrammeni is a historical and polytonic Greek character used primarily in ancient and liturgical texts, representing the letter eta (Η) combined with the diacritical marks for psili (smooth breathing), oxia (acute accent), and a subscripted prosgegrammeni (an iota adscript indicating a long diphthong). This character is a precomposed form that facilitates the accurate rendering of Greek orthography in scholarly editions of classical works and religious manuscripts, though it is rare in modern digital typography and often encountered only in specialized linguistic or academic contexts.