U+FF18 "８" Fullwidth Digit Eight Unicode Character

U+FF18 "８" Fullwidth Digit Eight is a variant of the standard digit "8" that occupies the same horizontal space as a CJK (Chinese, Japanese, and Korean) ideograph, making it twice as wide as a typical ASCII digit. It belongs to the Halfwidth and Fullwidth Forms block and is used primarily in East Asian typography to achieve visual uniformity when numbers are mixed with fullwidth characters in text. This character ensures that the digit aligns neatly with other fullwidth symbols, such as those found in Japanese or Chinese documents, while retaining the numerical value of the digit eight.

General Properties

Code Point	U+FF18
Version Added	1.1
Name	Fullwidth Digit Eight
Block	Halfwidth and Fullwidth Forms
General Category	Decimal Number
Canonical Combining Class	Not Reordered
Bidirectional Class	European Number
Decomposition Type	Wide
Decomposition Mapping	"8" U+0038 Digit Eight

Encodings

HTML Decimal Encoding	８
HTML Hex Encoding	８
UTF-8 Encoding	0xEF 0xBC 0x98
UTF-16 Encoding	0xFF18
UTF-32 Encoding	0x0000FF18
C/C++/Java Escape	\uff18

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	Decimal
Numeric Value	8
Line Break	Ideographic
East Asian Width	Fullwidth
Changes When NFKC Casefolded	Yes
NFKC Casefold	"8" U+0038 Digit Eight
NFKC Simple Casefold	"8" U+0038 Digit Eight
Script	Common
Script Extensions	Common
Indic Syllabic Category	Other
ID Continue	Yes
XID Continue	Yes
Hex Digit	Yes
Vertical Orientation	Upright
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Numeric
Sentence Break	Numeric