U+0374 "ʹ" Greek Numeral Sign Unicode Character

U+0374 "ʹ" Greek Numeral Sign is a typographic mark used in ancient and modern Greek to indicate that a letter or sequence of letters is being employed as a numeral, functioning similarly to an apostrophe in modern English but placed above the line or after the final letter. It appears primarily with Greek letters, such as in the notation for numbers like αʹ (1) or κʹ (20), distinguishing numeric values from ordinary text. Although it resembles the Greek tonos or the Latin apostrophe, it has a distinct Unicode definition and is not interchangeable with those characters, preserving its specific historical and mathematical role in Greek writing systems.

General Properties

Code Point	U+0374
Version Added	1.1
Name	Greek Numeral Sign
Unicode 1.0 Name	Greek Upper Numeral Sign
Block	Greek and Coptic
General Category	Modifier Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Other Neutral
Decomposition Type	Canonical
Decomposition Mapping	"ʹ" U+02B9 Modifier Letter Prime

Encodings

HTML Decimal Encoding	ʹ
HTML Hex Encoding	ʹ
UTF-8 Encoding	0xCD 0xB4
UTF-16 Encoding	0x0374
UTF-32 Encoding	0x00000374
C/C++/Java Escape	\u0374

Unicode Properties

Full Composition Exclusion	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Case Ignorable	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"ʹ" U+02B9 Modifier Letter Prime
NFKC Simple Casefold	"ʹ" U+02B9 Modifier Letter Prime
Script	Common
Script Extensions	Coptic Greek
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Diacritic	Yes
Alphabetic	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	OLetter