Block: Greek Extended

Range U+1F00 - U+1FFF
Official Chart http://www.unicode.org/charts/PDF/U1F00.pdf
Wikipedia Greek Extended is a Unicode block containing the accented vowels necessary for writing polytonic Greek. The regular, unaccented Greek characters can be found in the Greek and Coptic (Unicode block). Greek Extended was encoded in version 1.1 of the Unicode Standard as is, having had no additions up to 6.2.
https://en.wikipedia.org/wiki/Greek_Extended
Characters
Ἷ ὿ ᾿ ῿