U+FA05 "洞" CJK Compatibility Ideograph-# Unicode Character

U+FA05 "洞" CJK Compatibility Ideograph-# is a compatibility ideograph that maps to the standard CJK Unified Ideograph U+7AD7, which is the character for "cave" or "hole" (often written as 洞), but it is encoded in a separate block primarily to preserve the exact original form or variant glyph found in older, pre-unification character set standards, such as those from Japanese industrial standards or early Chinese encodings. Its purpose within the compatibility block is to ensure that text converted from those legacy systems maintains its intended appearance and roundtrip fidelity, even though modern systems typically prefer the unified encoding.

General Properties

Code Point	U+FA05
Version Added	1.1
Name	CJK Compatibility Ideograph-#
Block	CJK Compatibility Ideographs
General Category	Other Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Canonical
Decomposition Mapping	"洞" U+6D1E CJK Unified Ideograph-#

Encodings

HTML Decimal Encoding	洞
HTML Hex Encoding	洞
UTF-8 Encoding	0xEF 0xA8 0x85
UTF-16 Encoding	0xFA05
UTF-32 Encoding	0x0000FA05
C/C++/Java Escape	\ufa05

Unicode Properties

Full Composition Exclusion	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Ideographic
East Asian Width	Wide
Changes When NFKC Casefolded	Yes
NFKC Casefold	"洞" U+6D1E CJK Unified Ideograph-#
NFKC Simple Casefold	"洞" U+6D1E CJK Unified Ideograph-#
Script	Han
Script Extensions	Han
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Vertical Orientation	Upright
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Other
Sentence Break	OLetter
Ideographic	Yes

Unihan Properties

kCompatibilityVariant	U+6D1E
kDefinition	cave, grotto; ravine; hole
kHangul	통:0
kIRG_KSource	K0-7753
kKorean	THONG
kRSUnicode	85.6
kTotalStrokes	9