U+1D739 "𝜹" Mathematical Bold Italic Small Delta Unicode Character

U+1D739 "𝜹" Mathematical Bold Italic Small Delta is a typographical variant of the Greek letter delta, specifically designed for use in mathematical and scientific notation where a bold italic style is required to distinguish a variable or constant from plain text. It belongs to the Mathematical Alphanumeric Symbols block, which provides separate encoded representations for letters in various fonts to avoid ambiguity in technical documents. This character is most commonly employed in fields like physics and engineering to denote values such as a small increment, a partial derivative, or a specific thermodynamic quantity, ensuring consistent formatting across digital and printed equations.

General Properties

Code Point	U+1D739
Version Added	3.1
Name	Mathematical Bold Italic Small Delta
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"δ" U+03B4 Greek Small Letter Delta

Encodings

HTML Decimal Encoding	𝜹
HTML Hex Encoding	𝜹
UTF-8 Encoding	0xF0 0x9D 0x9C 0xB9
UTF-16 Encoding	0xD835 0xDF39
UTF-32 Encoding	0x0001D739
C/C++/Java Escape	\ud835\udf39

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	"δ" U+03B4 Greek Small Letter Delta
NFKC Simple Casefold	"δ" U+03B4 Greek Small Letter Delta
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