U+FB66 "ﭦ" Arabic Letter Tteh Isolated Form Unicode Character

U+FB66 "ﭦ" Arabic Letter Tteh Isolated Form is a presentation form of the Arabic letter tteh, which represents a retroflex or emphatic "t" sound used in certain languages like Urdu, Sindhi, and Kashmiri. This specific codepoint belongs to the Arabic Presentation Forms-A block, where it serves as a positional variant intended for use when the letter appears alone at the beginning or within text where special typographic shaping is required. While modern Unicode typically prefers encoding the standard Arabic letter with a joining behavior class, this isolated form was included for backward compatibility with older software and document formats that rely on precomposed glyphs.

General Properties

Code Point	U+FB66
Version Added	1.1
Name	Arabic Letter Tteh Isolated Form
Block	Arabic Presentation Forms-A
General Category	Other Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Arabic Letter
Decomposition Type	Isolated
Decomposition Mapping	"ٹ" U+0679 Arabic Letter Tteh

Encodings

HTML Decimal Encoding	ﭦ
HTML Hex Encoding	ﭦ
UTF-8 Encoding	0xEF 0xAD 0xA6
UTF-16 Encoding	0xFB66
UTF-32 Encoding	0x0000FB66
C/C++/Java Escape	\ufb66

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Changes When NFKC Casefolded	Yes
NFKC Casefold	"ٹ" U+0679 Arabic Letter Tteh
NFKC Simple Casefold	"ٹ" U+0679 Arabic Letter Tteh
Script	Arabic
Script Extensions	Arabic
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	OLetter