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# Zero

The concept of zero has many synonyms

• Empty
• None
• Nil
• Null
• Nought or naught (US)
• Void
• Zilch
• ...

## The number zero

Zero is usually not considered to belong to the set ${\displaystyle \scriptstyle \mathbb {N} \,}$ of natural numbers, as it was not even considered a number by the ancient Greeks and Romans. The number zero is represented by the Hindu-Arabic numeral 0. As a digit, 0 is used as a placeholder in place-value numeral systems.

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