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1 It originated from the Indian subcontinent

2 It formed part of the Hindu numeracy system

3 It was adapted by the Arabs who traded with India

4 It and other digits became known as the Hindu-Arabic numeral system

5 It was used in the ancient Mayan numeracy system but looked different

6 It's known as zero, nought or nothing

7 It's essential for the Hindu-Arabic numeral system to operate

8 It's not needed in the Roman numeral system

9 Its Roman numeral equivalent is N which in Latin is nihil

10 It reduces numbers to 1 when raised by its power: 1230 = 1

11 It's an integer in its own right

12 It's the freezing point of water in Centigrade

13 It tells us for example that there is a difference between 23 and 203

14 It's therefore vital for positional place value purposes

15 It's an even integer because it's between 2 odd integers

16 It signifies that an event will not happen in probability

17 It can be the start of a decimal number as for example: 0.125

18 It's expressed as 0% as a percentage

19 It has 12 of them in a trillion which is 1.0*1012 in scientific notation

20 Its best friend is 1 because they form the binary system

21 Its used in the title of a Shakespearean play

22 It's zero hour and time to blast off saying goodbye for now

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