0 may refer to:
- 0, a number, glyph, and Hindu-Arabic numeral
- The constant function whose value is zero for every element in its domain
- Slashed zero glyph used to distinguish the number '0' from the letter 'O' on character displays (see also the letter Ø)
- Root, also known as a "zero"
- Zero
- The telephone number dialed in the North American Numbering Plan to reach the telephone operator at the user's local telephone company, as opposed to dialing 00 for the long distance telephone company operator.
See also[]
- O (15th Letter)
- Zero
- Year zero
- 00
- A6M Zero - A Japanese fighter plane
- Absolute zero (Temperature)
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