0

• 0̸ (slashed zero, available only as a combination of Unicode characters, variation selectors or through font features)

Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numeral ‫٠ (0)‬ (compare Devanāgarī script ०), adopted for use with the Latin script in Europe. See 0 § History for more.

0

1. (Arabic digits) The cardinal number zero indicating absence of any quantity.
2. A digit in decimal, binary, and every other base numbering system.

   15 × 134 = 2010

   0000 0001₂

   0x1000E001 (hexadecimal notation)

3. (mathematics) The identity element with respect to addition.

   ${\displaystyle \exists \,\mathbf {0}$ :\forall a\in A:\mathbf {0} +a=a+\mathbf {0} =a}

4. (mathematics, computer science) A Boolean or truth value corresponding to false.

   f : B^k → B : B = {0, 1}

   A&B&C=0 → A=0 || B=0 || C=0

5. (computing) Indicates that the number that follows is in octal.
6. (phonetics, often superscript) the pitch of a tone that is more extreme than 1 (higher or lower, depending on local convention; e.g. 0 is the highest tone in Chatino)
7. (phonetics, Sinosphere, often superscript) lack of an inherent tone; the pitch depends on the tones of the surrounding syllables.

The following forms are equivalent as a decimal digit:

The additional following forms are equivalent as a cardinal number:

Gallery

• Styles
• 
  A vintage clock with numbers 0–11.
• 
  The digit ‘0’ in a digital seven segment display.

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

Other representations of 0:

• (number, digit, “zero”):
  • (General Australian, US) enPR: zē′rō, IPA^(key): /ˈziːɹəʊ/
  • (Received Pronunciation) IPA^(key): /ˈzɪəɹəʊ/

  • Audio (US)

    (file)

  • Rhymes: -ɪəɹəʊ
• (digit, “nought”):
  • (Received Pronunciation) IPA^(key): /ˈnɔːt/
  • Rhymes: -ɔːt
• (digit, “oh” o):
  • (Received Pronunciation) IPA^(key): /ˈəʊ/
  • Rhymes: -əʊ

  The pronunciation as a digit is very often shortened to that of the letter O to save time or keep rhythm. This change is required for the tens place of minutes following the hour and in shortened pronunciation of numbers between 10 and 19 hundred, including years, as well as their truncated two-digit forms, where the zero is a leading digit. It is also very common when saying telephone numbers, decimals after the decimal point, the leading zero in decimal fractions less than one, or many other words such as 007 double o seven.

0 (plural 0s)

1. 0.
2. The origin, starting point, or fixed reference point, especially for a measurement.

   The 0 for the Celsius scale is 273.15 Kelvin.

3. (electrical engineering) The off or low bit state.

   If the NOT gate input is 1, the output is 0.

• 0th, the ordinal number form

• 0 (number) in Wikipedia
• 1
• 2

0

1. (gay slang) bottom

• (Hong Kong Cantonese) 0仔 (ling⁴ zai²)

• 0.5 (língdiǎnwǔ)
• 1 (yī)

Grammaticisation of 零 (“zero”).

0

1. (Hong Kong Cantonese, Internet slang, neologism) A negation particle (clarification of this definition is needed)

• 2024, 陳詠儀 [Wing Yee Chan], 唐翊竣 [Yik Chun Tong], 謝家朗 [Ka Long Tse], “香港粵語否定詞“0”的語法特徵 [Grammatical Features of the Negative Word "0" in Hong Kong Cantonese]”, in 《中國語文通訊》, volume 103, number 1, →DOI, pages 43-65: