U+1D749 "𝝉" Mathematical Bold Italic Small Tau Unicode Character

U+1D749 "𝝉" Mathematical Bold Italic Small Tau is a typographic variant of the Greek letter tau, specifically designed for use in mathematical and scientific notation where a bold italic style is required to distinguish it from ordinary text. It belongs to the Mathematical Alphanumeric Symbols block, which provides a wide range of stylized letters, numbers, and symbols to represent variables, constants, and other mathematical objects in a clear and unambiguous way. This character is commonly employed in fields like physics and engineering, where tau often denotes torque, time constants, shear stress, or the proper time in relativity, and its bold italic form helps it stand out in dense equations or when used alongside other symbols.

General Properties

Code Point	U+1D749
Version Added	3.1
Name	Mathematical Bold Italic Small Tau
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"τ" U+03C4 Greek Small Letter Tau

Encodings

HTML Decimal Encoding	𝝉
HTML Hex Encoding	𝝉
UTF-8 Encoding	0xF0 0x9D 0x9D 0x89
UTF-16 Encoding	0xD835 0xDF49
UTF-32 Encoding	0x0001D749
C/C++/Java Escape	\ud835\udf49

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Lowercase	Yes
Cased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"τ" U+03C4 Greek Small Letter Tau
NFKC Simple Casefold	"τ" U+03C4 Greek Small Letter Tau
Script	Common
Script Extensions	Common
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Math	Yes
Other Math	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Lower