U+210C "ℌ" Black-Letter Capital H Unicode Character

U+210C "ℌ" Black-Letter Capital H is a decorative typographic symbol derived from medieval blackletter or Gothic script, often used in mathematical notation to represent the Hamiltonian operator, the Hilbert space, or the set of quaternions in various fields such as physics and abstract algebra. Its distinctive ornate appearance, resembling a stylized fraktur H, serves not only an aesthetic purpose but also helps distinguish it from the standard Latin capital H in technical writing and scholarly texts. This character belongs to the Letterlike Symbols block in Unicode, reflecting its role in bridging historical calligraphy with modern computing and academic notation.

General Properties

Code Point	U+210C
Version Added	1.1
Name	Black-Letter Capital H
Unicode 1.0 Name	Black-Letter H
Block	Letterlike Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"H" U+0048 Latin Capital Letter H

Encodings

HTML Decimal Encoding	ℌ
HTML Hex Encoding	ℌ
UTF-8 Encoding	0xE2 0x84 0x8C
UTF-16 Encoding	0x210C
UTF-32 Encoding	0x0000210C
C/C++/Java Escape	\u210c

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Uppercase	Yes
Cased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"h" U+0068 Latin Small Letter H
NFKC Simple Casefold	"h" U+0068 Latin Small Letter H
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	Upper