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In an op-amp (OPA838) the input impedance common-mode is as follows:

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What is the range for the input impedance? I want to interpret this: (35 || 1 MΩ || pF)

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It's not a range. It means that the complex input impedance is that of a parallel combination of 35 MΩ and 1pF, thus

$$ Z_{IN,CM}(\omega)=\left(\frac{1}{35\cdot10^6} + j\,\omega\cdot{10}^{-12} \right)^{-1} \,\Omega $$

The || symbol denotes a parallel connection. 35 || 1 in the units of MΩ||pF means 35MΩ||1pF.

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