U+1FBE "ι" Greek Prosgegrammeni Unicode Character

U+1FBE "ι" Greek Prosgegrammeni is a historic and typographically unique mark from the Greek script, functioning as an adscript iota that attaches to a preceding vowel but, unlike the standard iota subscript, sits on the line rather than beneath it. Represented by a small, smooth-breathing-like symbol, it appears in ancient Greek texts to indicate a long vowel where the iota has become silent or lost, and its Unicode classification as a modifier letter rather than a standard spacing character can cause confusion in modern rendering and search systems.

General Properties

Code Point	U+1FBE
Version Added	1.1
Name	Greek Prosgegrammeni
Block	Greek Extended
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Canonical
Decomposition Mapping	"ι" U+03B9 Greek Small Letter Iota

Encodings

HTML Decimal Encoding	ι
HTML Hex Encoding	ι
UTF-8 Encoding	0xE1 0xBE 0xBE
UTF-16 Encoding	0x1FBE
UTF-32 Encoding	0x00001FBE
C/C++/Java Escape	\u1fbe

Unicode Properties

Full Composition Exclusion	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Lowercase	Yes
Simple Uppercase Code Point	"Ι" U+0399 Greek Capital Letter Iota
Simple Titlecase Code Point	"Ι" U+0399 Greek Capital Letter Iota
Uppercase Code Point	"Ι" U+0399 Greek Capital Letter Iota
Titlecase Code Point	"Ι" U+0399 Greek Capital Letter Iota
Simple Case Folding	"ι" U+03B9 Greek Small Letter Iota
Case Folding	"ι" U+03B9 Greek Small Letter Iota
Cased	Yes
Changes When Casemapped	Yes
Changes When NFKC Casefolded	Yes
Changes When Titlecased	Yes
Changes When Uppercased	Yes
NFKC Casefold	"ι" U+03B9 Greek Small Letter Iota
NFKC Simple Casefold	"ι" U+03B9 Greek Small Letter Iota
Script	Greek
Script Extensions	Greek
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Lower