U+70EF "烯" CJK Unified Ideograph-# Unicode Character

Unicode Version 17.0

烯

U+70EF "烯" CJK Unified Ideograph-# is a Chinese character (hanzi) that primarily means "alkene" or "olefin" in modern chemical terminology, representing a class of hydrocarbons containing at least one carbon-carbon double bond. Its semantic radical is "火" (fire) on the left, while the phonetic component "希" (xī) contributes to its pronunciation as "xī" in Mandarin. This character is widely used in scientific and industrial contexts in East Asia, particularly in chemistry textbooks, laboratory reports, and material science to denote unsaturated hydrocarbons such as ethylene (乙烯) and propylene (丙烯). Historically, it was coined in the early 20th century as part of a systematic effort to create Chinese characters for chemical elements and compounds, combining the fire radical with the sound "xi" to reflect the flammable nature of many alkenes.

General Properties

Code Point	U+70EF
Version Added	1.1
Name	CJK Unified Ideograph-#
Block	CJK Unified Ideographs
General Category	Other Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right

Encodings

HTML Decimal Encoding	烯
HTML Hex Encoding	烯
UTF-8 Encoding	0xE7 0x83 0xAF
UTF-16 Encoding	0x70EF
UTF-32 Encoding	0x000070EF
C/C++/Java Escape	\u70ef

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
NFKC Quick Check	Yes
NFKD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Ideographic
East Asian Width	Wide
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
Unified Ideograph	Yes

Unihan Properties

kBigFive	B26D
kCCCII	225167
kCNS1986	1-5B72
kCNS1992	1-5B72
kCangjie	FKKB
kCantonese	hei1
kCihaiT	847.304
kDaeJaweon	1080.070
kDefinition	alkene
kEACC	225167
kFanqie	香衣
kFourCornerCode	9482.7
kGB0	4709
kGB1	4709
kHangul	희:N
kHanYu	32205.040
kHanyuPinyin	32205.040:xī
kIICore	AGTM
kIRGDaeJaweon	1080.070
kIRGHanyuDaZidian	32205.040
kIRGKangXi	0671.100
kIRG_GSource	G0-4F29
kIRG_HSource	HB1-B26D
kIRG_JSource	JMJ-016388
kIRG_KPSource	KP1-5540
kIRG_KSource	K2-4431
kIRG_TSource	T1-5B72
kJapanese	キケ
kKoreanName	2015
kTGH	2013:4957
kKangXi	0671.100
kMainlandTelegraph	7910
kMandarin	xī
kMojiJoho	MJ016388
kMorohashi	19037
kPhonetic	451
kRSUnicode	86.7
kSMSZD2003Index	397.04
kSMSZD2003Readings	xī粵hei1
kTaiwanTelegraph	9753
kTGHZ2013	392.040:xī
kTotalStrokes	11
kUnihanCore2020	GHMT
kXerox	301:315
kXHC1983	1230.070:xī