U+0389 "Ή" Greek Capital Letter Eta with Tonos Unicode Character

U+0389 "Ή" Greek Capital Letter Eta with Tonos is a precomposed version of the Greek capital letter eta (Η) combined with the tonos accent, which in modern Greek marks the stressed syllable in a word. This character is used primarily in the Greek script to indicate the high pitch or stress on the vowel eta when it appears as a capital letter, typically at the beginning of a sentence or in all-caps text. It belongs to the Greek and Coptic block of Unicode and is distinct from the sequence of a plain capital eta followed by a combining tonos, as it is encoded as a single, atomic character for compatibility and ease of use in legacy systems.