It is an empirical proportionality constant involved in the calculation of gravitational effects, which connects the gravitational force $F$ between two bodies with the product of their masses $m_1 m_2$ and the inverse square of their distance $r$: $F = G\frac{m_1 m_2}{r^2}$.
In SI units, its value is approximately $6.674 \times 10^{-11} m^3 \cdot kg^{-1} \cdot s^{-2}$.
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