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

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.

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.

• 
  Large seal script character
• 
  Small seal script character

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.

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]

• "Dictionary -> Characters containing component "一"". Chinese Text Project. Retrieved 2022-02-10.

• Fazzioli, Edoardo (1987). Chinese calligraphy : from pictograph to ideogram : the history of 214 essential Chinese/Japanese characters. calligraphy by Rebecca Hon Ko. New York: Abbeville Press. ISBN 0-89659-774-1.
• Li, Leyi (1993). Tracing the Roots of Chinese Characters: 500 Cases. Beijing. ISBN 978-7-5619-0204-2.{{cite book}}: CS1 maint: location missing publisher (link)

Wikimedia Commons has media related to Radical 001.

• Chinese numerals