U+1EF9 "ỹ" Latin Small Letter Y with Tilde Unicode Character

U+1EF9 "ỹ" Latin Small Letter Y with Tilde is a precomposed glyph used in the Vietnamese alphabet, where it represents the vowel sound of the letter Y with a tilde diacritic indicating a creaky or rising-falling tone. This character appears in the Latin Extended Additional block of Unicode and is commonly employed in the transcription of the Vietnamese language, such as in words like "ngày" or "chợ," to denote specific tonal pronunciation. Its uppercase counterpart is U+1EF8 "Ỹ" Latin Capital Letter Y with Tilde, and it is distinct from the standalone combination of a Y and a combining tilde (U+0079 plus U+0303), though functionally identical in rendering.

General Properties

Code Point	U+1EF9
Version Added	1.1
Name	Latin Small Letter Y with Tilde
Block	Latin Extended Additional
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Canonical
Decomposition Mapping	"y" U+0079 Latin Small Letter Y "̃" U+0303 Combining Tilde

Encodings

HTML Decimal Encoding	ỹ
HTML Hex Encoding	ỹ
UTF-8 Encoding	0xE1 0xBB 0xB9
UTF-16 Encoding	0x1EF9
UTF-32 Encoding	0x00001EF9
C/C++/Java Escape	\u1ef9

Unicode Properties

NFC Quick Check	Yes
NFKC Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Lowercase	Yes
Simple Uppercase Code Point	"Ỹ" U+1EF8 Latin Capital Letter Y with Tilde
Simple Titlecase Code Point	"Ỹ" U+1EF8 Latin Capital Letter Y with Tilde
Uppercase Code Point	"Ỹ" U+1EF8 Latin Capital Letter Y with Tilde
Titlecase Code Point	"Ỹ" U+1EF8 Latin Capital Letter Y with Tilde
Cased	Yes
Changes When Casemapped	Yes
Changes When Titlecased	Yes
Changes When Uppercased	Yes
Script	Latin
Script Extensions	Latin
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