Radical 1

"一" redirects here. For the punctuation mark, see ー.

Radical 1 or radical one (一部) meaning "one" is one of the 6 Kangxi radicals (214 radicals in total) composed of 1 stroke. It is the simplest Chinese character in the language due to consisting of only one line.

一
Radical 1 (U+2F00) 2 →
一 (U+4E00) "one"
Pronunciations
Pinyin:	yī
Bopomofo:	一
Gwoyeu Romatzyh:	i
Wade–Giles:	i1
Cantonese Yale:	yāt
Jyutping:	jat1
Pe̍h-ōe-jī:	it
Japanese Kana:	イチ ichi (on'yomi) ひと(つ) hito(tsu) (kun'yomi)
Sino-Korean:	일 il
Hán-Việt:	一 nhất
Names
Chinese name(s):	橫/横 héng
Japanese name(s):	一 ichi
Hangul:	한 han
Stroke order animation

In the Kangxi Dictionary, there are 60 characters (out of 47,043) to be found under this radical.^[1]

一 is also the 1st indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China.

Evolution

• 
  Large seal script character
• 
  Small seal script character

Derived characters

Some Chinese characters with Radical 1

Strokes	Characters[a]
+0	一
+1	丁 丂 七 丄 丅 丆
+2	万 (also SC/JP form of 萬 -> 艸) 丈 三 上 下 丌 与SC/与JP (also SC/JP form of 與 -> 臼)
+3	不 丏 丐 丑SC/JP/丑TC (also SC form of 醜 -> 酉) 丒 (=丑) 专SC (=專 -> 寸)
+4	且 丕 世 丘 丙 业SC (=業 -> 木) 丛SC (=叢 => 又) 东SC (=東 -> 木) 丝SC (=絲 -> 糸)
+5	丞 丟 丠 両JP (=兩 -> 入)
+6	丣 两SC (=兩 -> 入) 严SC (=嚴 -> 口)
+7	並 丧SC (=喪 -> 口)

Further information: wikt:Appendix:Chinese radical/一

In calligraphy

The horizontal line as in 永

The only stroke in radical one, known as 橫/横 héng "horizontal", is called 策 cè in the eight principles of the character 永 (永字八法 Yǒngzì Bāfǎ) which are the basis of Chinese calligraphy.

Sinogram

As an isolated character it is one of the Kyōiku kanji or Kanji taught in elementary school in Japan.^[2] It is a first grade kanji.^[2]