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abstraction
>
mathematical concept
>
number
>
constant
>
unit prefix
>
zepto
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zetta
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unit prefix
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yotta
zepto
(z)
subject
fact
zepto
has symbol
z
has value
10
-21
is an instance of
unit prefix
unit prefix
has rule
multiple prefixes may not be used
any
unit prefix
can be used with any
SI unit