U+1F139 "🄹" Squared Latin Capital Letter J Unicode Character

U+1F139 "🄹" Squared Latin Capital Letter J is a specialized typographic symbol used primarily in Japanese text encoding, where it represents the capital letter J enclosed within a square box. This character belongs to the Enclosed Alphanumeric Supplement block, designed to provide a compact and visually distinct way to denote the letter J for lists, indices, or labeling systems, often within the context of CJK (Chinese, Japanese, and Korean) computing environments. Despite its appearance, it is not commonly used in standard English writing, but it serves as a functional placeholder in various encoded diagrams or user interface elements where squared alphanumeric characters are required.

General Properties

Code Point	U+1F139
Version Added	6.0
Name	Squared Latin Capital Letter J
Block	Enclosed Alphanumeric Supplement
General Category	Other Symbol
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Square
Decomposition Mapping	"J" U+004A Latin Capital Letter J

Encodings

HTML Decimal Encoding	🄹
HTML Hex Encoding	🄹
UTF-8 Encoding	0xF0 0x9F 0x84 0xB9
UTF-16 Encoding	0xD83C 0xDD39
UTF-32 Encoding	0x0001F139
C/C++/Java Escape	\ud83c\udd39

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Ambiguous (Alphabetic or Ideographic)
East Asian Width	Ambiguous
Uppercase	Yes
Other Uppercase	Yes
Cased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"j" U+006A Latin Small Letter J
NFKC Simple Casefold	"j" U+006A Latin Small Letter J
Script	Common
Script Extensions	Common
Indic Syllabic Category	Other
Alphabetic	Yes
Other Alphabetic	Yes
Vertical Orientation	Upright
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Upper