What does the R stand for in the ideal gas law $\mathrm{pV}=\mathrm{nRT}$?

Ideal gas law:

• "The three laws (Boyle's, Charles', Avogadro) can be combined together in a single equation which is known as an ideal gas equation."
• It is represented as $\mathrm{pV}=\mathrm{nRT}$
• Where $\mathrm{p}$ is the pressure, $\mathrm{V}$ is the volume, $\mathrm{T}$ is the temperature of the gas and $\mathrm{R}$ stands for gas constant.
• It is the same for all gases. Therefore it is also called Universal Gas Constant.