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Is there a way to represent the number of times a value has repeated after a decimal point?

For example if I have:

0.9
0.99
0.999

Is there something like:

9E-1
9E-2
9E-3

That easily represents these values?

The Nightman
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    You could invent a notation... like say $0.\overset{3}{\fbox 8}5\overset 4{\fbox 7}1$ to mean $0.888577771$, but you'd need to define it clearly. – Joffan Jun 28 '18 at 22:45
  • @Joffan yeah that actually looks pretty easy to understand, assuming there is nothing already out there. Thanks. – The Nightman Jun 28 '18 at 22:51
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    If you are looking very specifically at the sequence $0.9,0.99,0.999,\dots$. You can recognize that this is the sequence $1-0.1^n$. If you want three nines repeated, that's $1-0.1^3$. If you want a hundred nines repeated, that's $1-0.1^{100}$, etc... – JMoravitz Jun 28 '18 at 23:07

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