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abstraction
>
mathematical concept
>
number
>
constant
>
unit prefix
>
peta
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pico
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unit prefix
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nano
peta
(P)
subject
fact
peta
has symbol
P
has value
10
15
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