1

Unicode name	DIGIT ONE
Codepoint	U+0031
0 ← Basic Latin → 2

See also I, l, and Ӏ

Translingual

Etymology

Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numerals (compare Devanagari script १ (1, “éka”)), possibly influenced by Roman numeral Ⅰ.

Symbol

1

1. The cardinal number one, a single thing or unit.
2. A digit in decimal and every other base numbering system, including binary, octal, and hexadecimal.

   15 × 134 = 2010

   0010 0011₂

   0x1000E001

3. (mathematics) The identity element with respect to multiplication in a ring.

   a×1 = a

4. (computer science) Bit state corresponding to binary digit 1, or on or true.
5. (mathematics) A Boolean or truth value corresponding to true.

   f : B^k → B : B = {0, 1}

See also

• (Arabic digits): 0  1  2  3  4  5  6  7  8  9

Alternative forms

Arabic (Eastern) numerals: ١ Arabic (Western) numerals: 1 Bengali numerals: ১ Chinese numerals: 壹 , 一 Ethiopic numerals: ፩ Gujarati numerals: ૧ Gurmukhi numerals: ੧ Hebrew numerals: א Hindi numerals: १

Kannada numerals: ೧ Khmer numerals: ១ Lao numerals: ໑ Limbu numerals: ᥇ Malayalam numerals: ൧ Mongolian numerals: ᠑ Myanmar numerals: ၁ Ol Chiki numerals: ᱑ Oriya numerals: ୧

Osmanya numerals: 𐒡 Persian numerals: ۱ Roman numerals: I Saurashtra numerals: ꣑ Sundanese numerals: ᮱ Tamil numerals: ௧ Telugu numerals: ౧ Thai numerals: ๑ Tibetan numerals: ༡

Derived terms

Derived terms

(select cardinal numbers containing ‘1’) 10, 11, 12, ..., 100, 101, 102, ..., 1000, ..., 10,000, 100,000, 1,000,000, ... (other select numbers containing ‘1’) -10, -1, -0.1, ..., 0.1, 0.01, 0.001, ...

See also

• 1 (number) in Wikipedia

Other representations of 1:

Morse code: ·–––– Braille: ⠁ ASL Manual: 1@Side-PalmBack

Signal flag (ICS and NATO):

Semaphore: After showing "numeric"

• Styles
• 

  The digit ‘1’ in a digital seven segment display.

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English

Pronunciation

• enPR: wŭn, IPA: /wʌn/, IPA: /wan/ SAMPA: /wVn/

• Audio (US)

  (file)

  Rhymes: -ʌn

Symbol

1 (plural 1s)

1. 1.
2. (Internet slang, leetspeak, sarcastic) Deliberate misspelling of !, imitating noobs who forget to hold down the shift key while typing exclamation marks.

   A: sum1 hlep me plz im alwyz l0zin!!1!?!/?

   B: Thts bcuz ur st00pid!!!!!11!!oneone!!1!!eleven!1

Derived terms

• (ordinal) 1st

Synonyms

• (sarcastic, deliberate misspelling of !): one, eleven

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American Sign Language

Cardinal number

1

1. one

Noun

1

1. A metasyntactic variable used to denote a person.