# 1

 1 U+0031, 1 DIGIT ONE
 ← 0[U+0030] Basic Latin 2 →[U+0032]
 ¹ U+00B9, ¹ SUPERSCRIPT ONE
 ← ¸[U+00B8] Latin-1 Supplement º →[U+00BA]

## Translingual

### Etymology

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

### 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 : Bk → B : B = {0, 1}
6. (mathematics) The one-point topological space, trivial ring, trivial group, a category with a single object or a (canonical) singleton.
7. (mathematics, set theory) indicator function of a set.

• (Arabic digits):

#### Alternative forms

 Javanese numerals: please add, if you can 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 Sinhalese numerals: please add, if you can Sundanese numerals: ᮱ Tamil numerals: ௧ Telugu numerals: ౧ Thai numerals: ๑ Tibetan numerals: ༡

#### Derived terms

Other representations of 1:

 Morse code: ·–––– Braille: ⠁ ASL Manual: 1@Side-PalmBack Signal flag (ICS and NATO): Semaphore: After showing "numeric"

## English

### Symbol

1

1. The number one (1).
2. (Internet slang, leetspeak, sarcastic) Deliberate misspelling of !, imitating someone who is too excited to consistently press 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

## American Sign Language

1

1. one

### Noun

1

1. A metasyntactic variable used to denote a person.

## Chinese

### Noun

1

1. (slang) top (gay slang)