U+1D66 "ᵦ" Greek Subscript Small Letter Beta Unicode Character

U+1D66 "ᵦ" Greek Subscript Small Letter Beta is a specialized typographic symbol used primarily in phonetic transcription, particularly within the International Phonetic Alphabet or related linguistic notation systems, where it represents a modified or subscript version of the Greek letter beta. This character is distinct from ordinary alphabetic letters and is classified under the Unicode block "Phonetic Extensions," serving to denote a specific phonetic quality or diacritic role, such as indicating a breathy or voiced bilabial fricative, without the need for combining marks. Its inclusion in Unicode ensures consistent digital representation across platforms and documents, supporting precise scholarly communication in fields like linguistics and historical philology.

General Properties

Code Point	U+1D66
Version Added	4.0
Name	Greek Subscript Small Letter Beta
Block	Phonetic Extensions
General Category	Modifier Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Sub
Decomposition Mapping	"β" U+03B2 Greek Small Letter Beta

Encodings

HTML Decimal Encoding	ᵦ
HTML Hex Encoding	ᵦ
UTF-8 Encoding	0xE1 0xB5 0xA6
UTF-16 Encoding	0x1D66
UTF-32 Encoding	0x00001D66
C/C++/Java Escape	\u1d66

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Lowercase	Yes
Other Lowercase	Yes
Case Ignorable	Yes
Cased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"β" U+03B2 Greek Small Letter Beta
NFKC Simple Casefold	"β" U+03B2 Greek Small Letter Beta
Script	Greek
Script Extensions	Greek
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Diacritic	Yes
Alphabetic	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Lower