IP3 may refer to:
*
Inositol trisphosphate (IP
3), used for signal transduction in biological cells
*
Third-order intercept point
In telecommunications, a third-order intercept point (IP3 or TOI) is a specific figure of merit associated with the more general third-order intermodulation distortion (IMD3), which is a measure for weakly nonlinear systems and devices, for exampl ...
, in radio telecommunication
*
IP3 International, a nuclear technology company
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