U+1D73A "𝜺" Mathematical Bold Italic Small Epsilon Unicode Character

U+1D73A "𝜺" Mathematical Bold Italic Small Epsilon is a typographic variant of the Greek letter epsilon, specifically designed for use in mathematical and scientific notation where a bold italic style helps distinguish it from standard text or other symbols. It belongs to the Mathematical Alphanumeric Symbols block, which was added to Unicode to allow precise representation of mathematical expressions in digital formats without relying on font styling. This character is commonly used in fields such as calculus, set theory, and physics when denoting small positive quantities, elements of a set, or error terms, providing a clear and unambiguous visual form that aligns with traditional mathematical typesetting conventions.

General Properties

Code Point	U+1D73A
Version Added	3.1
Name	Mathematical Bold Italic Small Epsilon
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"ε" U+03B5 Greek Small Letter Epsilon

Encodings

HTML Decimal Encoding	𝜺
HTML Hex Encoding	𝜺
UTF-8 Encoding	0xF0 0x9D 0x9C 0xBA
UTF-16 Encoding	0xD835 0xDF3A
UTF-32 Encoding	0x0001D73A
C/C++/Java Escape	\ud835\udf3a

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	"ε" U+03B5 Greek Small Letter Epsilon
NFKC Simple Casefold	"ε" U+03B5 Greek Small Letter Epsilon
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